diff --git a/modules/io.github.xenfork.freeworld.client/src/main/java/io/github/xenfork/freeworld/client/Freeworld.java b/modules/io.github.xenfork.freeworld.client/src/main/java/io/github/xenfork/freeworld/client/Freeworld.java
index 39c3ebd..f349d95 100644
--- a/modules/io.github.xenfork.freeworld.client/src/main/java/io/github/xenfork/freeworld/client/Freeworld.java
+++ b/modules/io.github.xenfork.freeworld.client/src/main/java/io/github/xenfork/freeworld/client/Freeworld.java
@@ -20,6 +20,7 @@
 import io.github.xenfork.freeworld.world.block.BlockTypes;
 import io.github.xenfork.freeworld.world.entity.Entity;
 import io.github.xenfork.freeworld.world.entity.EntityTypes;
+import org.joml.Vector2d;
 import org.slf4j.Logger;
 import overrun.marshal.Unmarshal;
 import overrungl.glfw.GLFW;
@@ -107,10 +108,10 @@ public void start() {
         EntityTypes.bootstrap();
         BuiltinRegistries.ENTITY_TYPE.freeze();
 
-        camera.setPosition(1.5, 16.0, 1.5);
-
         world = new World("New world");
         player = new Entity(world, UUID.randomUUID(), EntityTypes.PLAYER);
+        player.position().position().set(1.5, 16.0, 1.5);
+        world.entities.add(player);
 
         initGL();
         run();
@@ -141,7 +142,19 @@ private void onCursorPos(double x, double y) {
         cursorDeltaX = x - cursorX;
         cursorDeltaY = y - cursorY;
         if (disableCursor) {
-            camera.rotate(-cursorDeltaY * MOUSE_SENSITIVITY, -cursorDeltaX * MOUSE_SENSITIVITY);
+            final double pitch = -cursorDeltaY * MOUSE_SENSITIVITY;
+            final double yaw = -cursorDeltaX * MOUSE_SENSITIVITY;
+            final Vector2d rotation = player.rotation().rotation();
+            final double updateX = Math.clamp(rotation.x() + pitch, -90.0, 90.0);
+            double updateY = rotation.y() + yaw;
+
+            if (updateY < 0.0) {
+                updateY += 360.0;
+            } else if (updateY >= 360.0) {
+                updateY -= 360.0;
+            }
+
+            rotation.set(updateX, updateY);
         }
         cursorX = x;
         cursorY = y;
@@ -149,6 +162,7 @@ private void onCursorPos(double x, double y) {
 
     private void tick() {
         camera.preUpdate();
+        world.tick();
         final double speed = 0.5;
         double xo = 0.0;
         double yo = 0.0;
@@ -159,7 +173,7 @@ private void tick() {
         if (glfw.getKey(window, GLFW.KEY_D) == GLFW.PRESS) xo += 1.0;
         if (glfw.getKey(window, GLFW.KEY_LEFT_SHIFT) == GLFW.PRESS) yo -= 1.0;
         if (glfw.getKey(window, GLFW.KEY_SPACE) == GLFW.PRESS) yo += 1.0;
-        camera.moveRelative(xo, yo, zo, speed);
+        player.velocity().velocity().set(xo, yo, zo).mul(speed);
     }
 
     private void initGL() {
@@ -227,6 +241,10 @@ public World world() {
         return world;
     }
 
+    public Entity player() {
+        return player;
+    }
+
     public static Freeworld getInstance() {
         return INSTANCE;
     }
diff --git a/modules/io.github.xenfork.freeworld.client/src/main/java/io/github/xenfork/freeworld/client/render/Camera.java b/modules/io.github.xenfork.freeworld.client/src/main/java/io/github/xenfork/freeworld/client/render/Camera.java
index af0e7af..ad51ed9 100644
--- a/modules/io.github.xenfork.freeworld.client/src/main/java/io/github/xenfork/freeworld/client/render/Camera.java
+++ b/modules/io.github.xenfork.freeworld.client/src/main/java/io/github/xenfork/freeworld/client/render/Camera.java
@@ -10,6 +10,10 @@
 
 package io.github.xenfork.freeworld.client.render;
 
+import io.github.xenfork.freeworld.world.entity.Entity;
+import io.github.xenfork.freeworld.world.entity.component.PositionComponent;
+import io.github.xenfork.freeworld.world.entity.component.RotationXYComponent;
+import io.github.xenfork.freeworld.world.entity.system.EntitySystem;
 import org.joml.*;
 
 import java.lang.Math;
@@ -25,42 +29,11 @@ public final class Camera {
     private final Vector2d rotation = new Vector2d();
     private final Matrix4f viewMatrix = new Matrix4f();
 
-    public void setPosition(double x, double y, double z) {
-        position.set(x, y, z);
-    }
-
-    public void move(double x, double y, double z) {
-        position.add(x, y, z);
-    }
-
-    public void moveRelative(double x, double y, double z, double speed) {
-        final double dest = x * x + z * z;
-        if (dest > 0.001) {
-            final double sqrt = Math.sqrt(dest);
-            final double invSqrt = 1.0 / sqrt;
-            final double yaw = Math.toRadians(rotation.y());
-
-            final double normalX = x * invSqrt * speed;
-            final double normalZ = z * invSqrt * speed;
-            final double sin = Math.sin(yaw);
-            final double cos = Math.cos(yaw);
-            position.x += normalX * cos + normalZ * sin;
-            position.z += normalZ * cos - normalX * sin;
+    public void moveToEntity(Entity entity) {
+        if (EntitySystem.filter(entity, PositionComponent.ID, RotationXYComponent.ID)) {
+            position.set(entity.position().position());
+            rotation.set(entity.rotation().rotation());
         }
-        position.y += y * speed;
-    }
-
-    public void rotate(double pitch, double yaw) {
-        final double updateX = Math.clamp(rotation.x() + pitch, -90.0, 90.0);
-        double updateY = rotation.y() + yaw;
-
-        if (updateY < 0.0) {
-            updateY += 360.0;
-        } else if (updateY >= 360.0) {
-            updateY -= 360.0;
-        }
-
-        rotation.set(updateX, updateY);
     }
 
     public void preUpdate() {
diff --git a/modules/io.github.xenfork.freeworld.client/src/main/java/io/github/xenfork/freeworld/client/render/GameRenderer.java b/modules/io.github.xenfork.freeworld.client/src/main/java/io/github/xenfork/freeworld/client/render/GameRenderer.java
index b8b6098..6663b6e 100644
--- a/modules/io.github.xenfork.freeworld.client/src/main/java/io/github/xenfork/freeworld/client/render/GameRenderer.java
+++ b/modules/io.github.xenfork.freeworld.client/src/main/java/io/github/xenfork/freeworld/client/render/GameRenderer.java
@@ -103,6 +103,7 @@ public void render(GLStateMgr gl, double partialTick) {
             1000.0f
         );
         final Camera camera = client.camera();
+        camera.moveToEntity(client.player());
         camera.updateLerp(partialTick);
         camera.updateViewMatrix();
         projectionView.mul(camera.viewMatrix());
diff --git a/modules/io.github.xenfork.freeworld.core/src/main/java/io/github/xenfork/freeworld/util/MathUtil.java b/modules/io.github.xenfork.freeworld.core/src/main/java/io/github/xenfork/freeworld/util/MathUtil.java
new file mode 100644
index 0000000..cad2c93
--- /dev/null
+++ b/modules/io.github.xenfork.freeworld.core/src/main/java/io/github/xenfork/freeworld/util/MathUtil.java
@@ -0,0 +1,43 @@
+/*
+ * freeworld - 3D sandbox game
+ * Copyright (C) 2024  XenFork Union
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ */
+
+package io.github.xenfork.freeworld.util;
+
+import org.joml.Vector3d;
+
+/**
+ * @author squid233
+ * @since 0.1.0
+ */
+public final class MathUtil {
+    private MathUtil() {
+    }
+
+    public static Vector3d moveRelative(double x, double y, double z, double yawDegrees, Vector3d dest) {
+        final double dst = x * x + z * z;
+        double moveX = 0.0;
+        double moveY = 0.0;
+        double moveZ = 0.0;
+        if (dst > 0.001) {
+            final double sqrt = Math.sqrt(dst);
+            final double invSqrt = 1.0 / sqrt;
+            final double yaw = Math.toRadians(yawDegrees);
+
+            final double normalX = x * invSqrt;
+            final double normalZ = z * invSqrt;
+            final double sin = Math.sin(yaw);
+            final double cos = Math.cos(yaw);
+            moveX += normalX * cos + normalZ * sin;
+            moveZ += normalZ * cos - normalX * sin;
+        }
+        moveY += y;
+        return dest.set(moveX, moveY, moveZ);
+    }
+}
diff --git a/modules/io.github.xenfork.freeworld.core/src/main/java/io/github/xenfork/freeworld/world/World.java b/modules/io.github.xenfork.freeworld.core/src/main/java/io/github/xenfork/freeworld/world/World.java
index b2b01fc..ae37025 100644
--- a/modules/io.github.xenfork.freeworld.core/src/main/java/io/github/xenfork/freeworld/world/World.java
+++ b/modules/io.github.xenfork.freeworld.core/src/main/java/io/github/xenfork/freeworld/world/World.java
@@ -11,7 +11,10 @@
 package io.github.xenfork.freeworld.world;
 
 import io.github.xenfork.freeworld.world.chunk.Chunk;
+import io.github.xenfork.freeworld.world.entity.Entity;
+import io.github.xenfork.freeworld.world.entity.system.MotionSystem;
 
+import java.util.ArrayList;
 import java.util.List;
 
 /**
@@ -24,11 +27,17 @@ public final class World {
     public final Chunk c2 = new Chunk(this, 0, 0, 1);
     public final Chunk c3 = new Chunk(this, 1, 0, 1);
     public final List<Chunk> chunks = List.of(c0, c1, c2, c3);
+    public final List<Entity> entities = new ArrayList<>();
+    public final MotionSystem motionSystem = new MotionSystem();
 
     public World(String name) {
         chunks.forEach(Chunk::generateTerrain);
     }
 
+    public void tick() {
+        motionSystem.process(entities);
+    }
+
     public Chunk createChunk(int x, int y, int z) {
         return new Chunk(this, x, y, z);
     }
diff --git a/modules/io.github.xenfork.freeworld.core/src/main/java/io/github/xenfork/freeworld/world/entity/Entity.java b/modules/io.github.xenfork.freeworld.core/src/main/java/io/github/xenfork/freeworld/world/entity/Entity.java
index 1651abf..8d165a0 100644
--- a/modules/io.github.xenfork.freeworld.core/src/main/java/io/github/xenfork/freeworld/world/entity/Entity.java
+++ b/modules/io.github.xenfork.freeworld.core/src/main/java/io/github/xenfork/freeworld/world/entity/Entity.java
@@ -10,13 +10,13 @@
 
 package io.github.xenfork.freeworld.world.entity;
 
+import io.github.xenfork.freeworld.core.Identifier;
 import io.github.xenfork.freeworld.world.World;
-import io.github.xenfork.freeworld.world.entity.component.EntityComponent;
-import io.github.xenfork.freeworld.world.entity.component.PositionComponent;
-import io.github.xenfork.freeworld.world.entity.component.VelocityComponent;
+import io.github.xenfork.freeworld.world.entity.component.*;
 
 import java.util.HashMap;
 import java.util.Map;
+import java.util.Objects;
 import java.util.UUID;
 
 /**
@@ -27,34 +27,45 @@ public final class Entity {
     private final World world;
     private final UUID uuid;
     private final EntityType entityType;
-    private final Map<String, EntityComponent> componentMap = new HashMap<>();
+    private final Map<Identifier, EntityComponent> componentMap = new HashMap<>();
 
     public Entity(World world, UUID uuid, EntityType entityType) {
         this.world = world;
         this.uuid = uuid;
         this.entityType = entityType;
-        entityType.defaultComponents().forEach(this::addComponent);
+        for (var supplier : entityType.defaultComponents()) {
+            addComponent(supplier.get());
+        }
     }
 
     public void addComponent(EntityComponent component) {
-        final String name = component.componentName();
-        if (componentMap.containsKey(name)) {
+        Objects.requireNonNull(component);
+        final Identifier id = component.componentId();
+        if (componentMap.containsKey(id)) {
             return;
         }
-        componentMap.put(name, component);
+        componentMap.put(id, component);
     }
 
     @SuppressWarnings("unchecked")
-    public <T extends EntityComponent> T getComponent(String name) {
-        return (T) componentMap.get(name);
+    public <T extends EntityComponent> T getComponent(Identifier id) {
+        return (T) componentMap.get(id);
+    }
+
+    public boolean hasComponent(Identifier id) {
+        return componentMap.containsKey(id);
     }
 
     public PositionComponent position() {
-        return getComponent(PositionComponent.NAME);
+        return getComponent(PositionComponent.ID);
+    }
+
+    public RotationXYComponent rotation() {
+        return getComponent(RotationXYComponent.ID);
     }
 
     public VelocityComponent velocity() {
-        return getComponent(VelocityComponent.NAME);
+        return getComponent(VelocityComponent.ID);
     }
 
     public World world() {
diff --git a/modules/io.github.xenfork.freeworld.core/src/main/java/io/github/xenfork/freeworld/world/entity/EntityType.java b/modules/io.github.xenfork.freeworld.core/src/main/java/io/github/xenfork/freeworld/world/entity/EntityType.java
index 541501c..5e3cf42 100644
--- a/modules/io.github.xenfork.freeworld.core/src/main/java/io/github/xenfork/freeworld/world/entity/EntityType.java
+++ b/modules/io.github.xenfork.freeworld.core/src/main/java/io/github/xenfork/freeworld/world/entity/EntityType.java
@@ -13,6 +13,7 @@
 import io.github.xenfork.freeworld.world.entity.component.EntityComponent;
 
 import java.util.List;
+import java.util.function.Supplier;
 
 /**
  * @author squid233
@@ -20,13 +21,13 @@
  */
 @SuppressWarnings("ClassCanBeRecord")
 public final class EntityType {
-    private final List<EntityComponent> defaultComponents;
+    private final List<Supplier<EntityComponent>> defaultComponents;
 
-    public EntityType(List<EntityComponent> defaultComponents) {
+    public EntityType(List<Supplier<EntityComponent>> defaultComponents) {
         this.defaultComponents = defaultComponents;
     }
 
-    public List<EntityComponent> defaultComponents() {
+    public List<Supplier<EntityComponent>> defaultComponents() {
         return defaultComponents;
     }
 }
diff --git a/modules/io.github.xenfork.freeworld.core/src/main/java/io/github/xenfork/freeworld/world/entity/EntityTypes.java b/modules/io.github.xenfork.freeworld.core/src/main/java/io/github/xenfork/freeworld/world/entity/EntityTypes.java
index 80fbdc7..ef35839 100644
--- a/modules/io.github.xenfork.freeworld.core/src/main/java/io/github/xenfork/freeworld/world/entity/EntityTypes.java
+++ b/modules/io.github.xenfork.freeworld.core/src/main/java/io/github/xenfork/freeworld/world/entity/EntityTypes.java
@@ -14,6 +14,7 @@
 import io.github.xenfork.freeworld.core.registry.BuiltinRegistries;
 import io.github.xenfork.freeworld.core.registry.Registry;
 import io.github.xenfork.freeworld.world.entity.component.PositionComponent;
+import io.github.xenfork.freeworld.world.entity.component.RotationXYComponent;
 import io.github.xenfork.freeworld.world.entity.component.VelocityComponent;
 
 import java.util.List;
@@ -23,7 +24,15 @@
  * @since 0.1.0
  */
 public final class EntityTypes {
-    public static final EntityType PLAYER = register(0, "player", new EntityType(List.of(new PositionComponent(), new VelocityComponent())));
+    public static final EntityType PLAYER = register(0, "player",
+        new EntityType(List.of(
+            PositionComponent::new,
+            RotationXYComponent::new,
+            VelocityComponent::new
+        )));
+
+    private EntityTypes() {
+    }
 
     private static EntityType register(int rawId, String name, EntityType entityType) {
         return Registry.register(BuiltinRegistries.ENTITY_TYPE, Identifier.ofBuiltin(name), rawId, entityType);
diff --git a/modules/io.github.xenfork.freeworld.core/src/main/java/io/github/xenfork/freeworld/world/entity/component/EntityComponent.java b/modules/io.github.xenfork.freeworld.core/src/main/java/io/github/xenfork/freeworld/world/entity/component/EntityComponent.java
index 8415a9b..b798fbf 100644
--- a/modules/io.github.xenfork.freeworld.core/src/main/java/io/github/xenfork/freeworld/world/entity/component/EntityComponent.java
+++ b/modules/io.github.xenfork.freeworld.core/src/main/java/io/github/xenfork/freeworld/world/entity/component/EntityComponent.java
@@ -10,15 +10,15 @@
 
 package io.github.xenfork.freeworld.world.entity.component;
 
+import io.github.xenfork.freeworld.core.Identifier;
+
 /**
  * @author squid233
  * @since 0.1.0
  */
-public sealed interface EntityComponent permits
-    PositionComponent,
-    VelocityComponent {
+public sealed interface EntityComponent permits PositionComponent, RotationXYComponent, VelocityComponent {
     /**
-     * {@return a unique name of this component}
+     * {@return a unique identifier of this component}
      */
-    String componentName();
+    Identifier componentId();
 }
diff --git a/modules/io.github.xenfork.freeworld.core/src/main/java/io/github/xenfork/freeworld/world/entity/component/PositionComponent.java b/modules/io.github.xenfork.freeworld.core/src/main/java/io/github/xenfork/freeworld/world/entity/component/PositionComponent.java
index a5d4e28..20a1f7b 100644
--- a/modules/io.github.xenfork.freeworld.core/src/main/java/io/github/xenfork/freeworld/world/entity/component/PositionComponent.java
+++ b/modules/io.github.xenfork.freeworld.core/src/main/java/io/github/xenfork/freeworld/world/entity/component/PositionComponent.java
@@ -10,6 +10,7 @@
 
 package io.github.xenfork.freeworld.world.entity.component;
 
+import io.github.xenfork.freeworld.core.Identifier;
 import org.joml.Vector3d;
 
 /**
@@ -17,14 +18,14 @@
  * @since 0.1.0
  */
 public record PositionComponent(Vector3d position) implements EntityComponent {
-    public static final String NAME = "position";
+    public static final Identifier ID = Identifier.ofBuiltin("position");
 
     public PositionComponent() {
         this(new Vector3d());
     }
 
     @Override
-    public String componentName() {
-        return NAME;
+    public Identifier componentId() {
+        return ID;
     }
 }
diff --git a/modules/io.github.xenfork.freeworld.core/src/main/java/io/github/xenfork/freeworld/world/entity/component/RotationXYComponent.java b/modules/io.github.xenfork.freeworld.core/src/main/java/io/github/xenfork/freeworld/world/entity/component/RotationXYComponent.java
new file mode 100644
index 0000000..1b8fe85
--- /dev/null
+++ b/modules/io.github.xenfork.freeworld.core/src/main/java/io/github/xenfork/freeworld/world/entity/component/RotationXYComponent.java
@@ -0,0 +1,31 @@
+/*
+ * freeworld - 3D sandbox game
+ * Copyright (C) 2024  XenFork Union
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ */
+
+package io.github.xenfork.freeworld.world.entity.component;
+
+import io.github.xenfork.freeworld.core.Identifier;
+import org.joml.Vector2d;
+
+/**
+ * @author squid233
+ * @since 0.1.0
+ */
+public record RotationXYComponent(Vector2d rotation) implements EntityComponent {
+    public static final Identifier ID = Identifier.ofBuiltin("rotation");
+
+    public RotationXYComponent() {
+        this(new Vector2d());
+    }
+
+    @Override
+    public Identifier componentId() {
+        return ID;
+    }
+}
diff --git a/modules/io.github.xenfork.freeworld.core/src/main/java/io/github/xenfork/freeworld/world/entity/component/VelocityComponent.java b/modules/io.github.xenfork.freeworld.core/src/main/java/io/github/xenfork/freeworld/world/entity/component/VelocityComponent.java
index 7158097..49d72cc 100644
--- a/modules/io.github.xenfork.freeworld.core/src/main/java/io/github/xenfork/freeworld/world/entity/component/VelocityComponent.java
+++ b/modules/io.github.xenfork.freeworld.core/src/main/java/io/github/xenfork/freeworld/world/entity/component/VelocityComponent.java
@@ -10,6 +10,7 @@
 
 package io.github.xenfork.freeworld.world.entity.component;
 
+import io.github.xenfork.freeworld.core.Identifier;
 import org.joml.Vector3d;
 
 /**
@@ -17,14 +18,14 @@
  * @since 0.1.0
  */
 public record VelocityComponent(Vector3d velocity) implements EntityComponent {
-    public static final String NAME = "velocity";
+    public static final Identifier ID = Identifier.ofBuiltin("velocity");
 
     public VelocityComponent() {
         this(new Vector3d());
     }
 
     @Override
-    public String componentName() {
-        return NAME;
+    public Identifier componentId() {
+        return ID;
     }
 }
diff --git a/modules/io.github.xenfork.freeworld.core/src/main/java/io/github/xenfork/freeworld/world/entity/system/EntitySystem.java b/modules/io.github.xenfork.freeworld.core/src/main/java/io/github/xenfork/freeworld/world/entity/system/EntitySystem.java
new file mode 100644
index 0000000..f4bb3ce
--- /dev/null
+++ b/modules/io.github.xenfork.freeworld.core/src/main/java/io/github/xenfork/freeworld/world/entity/system/EntitySystem.java
@@ -0,0 +1,35 @@
+/*
+ * freeworld - 3D sandbox game
+ * Copyright (C) 2024  XenFork Union
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ */
+
+package io.github.xenfork.freeworld.world.entity.system;
+
+import io.github.xenfork.freeworld.core.Identifier;
+import io.github.xenfork.freeworld.world.entity.Entity;
+
+import java.util.List;
+
+/**
+ * @author squid233
+ * @since 0.1.0
+ */
+public interface EntitySystem {
+    void process(List<Entity> entities);
+
+    static boolean filter(Entity entity, Identifier... componentIds) {
+        if (entity == null) return false;
+
+        for (Identifier id : componentIds) {
+            if (entity.hasComponent(id)) {
+                return true;
+            }
+        }
+        return false;
+    }
+}
diff --git a/modules/io.github.xenfork.freeworld.core/src/main/java/io/github/xenfork/freeworld/world/entity/system/MotionSystem.java b/modules/io.github.xenfork.freeworld.core/src/main/java/io/github/xenfork/freeworld/world/entity/system/MotionSystem.java
new file mode 100644
index 0000000..5fef380
--- /dev/null
+++ b/modules/io.github.xenfork.freeworld.core/src/main/java/io/github/xenfork/freeworld/world/entity/system/MotionSystem.java
@@ -0,0 +1,43 @@
+/*
+ * freeworld - 3D sandbox game
+ * Copyright (C) 2024  XenFork Union
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ */
+
+package io.github.xenfork.freeworld.world.entity.system;
+
+import io.github.xenfork.freeworld.util.MathUtil;
+import io.github.xenfork.freeworld.world.entity.Entity;
+import io.github.xenfork.freeworld.world.entity.component.PositionComponent;
+import io.github.xenfork.freeworld.world.entity.component.RotationXYComponent;
+import io.github.xenfork.freeworld.world.entity.component.VelocityComponent;
+import org.joml.Vector2d;
+import org.joml.Vector3d;
+
+import java.util.List;
+
+/**
+ * @author squid233
+ * @since 0.1.0
+ */
+public final class MotionSystem implements EntitySystem {
+    private final Vector3d movement = new Vector3d();
+
+    @Override
+    public void process(List<Entity> entities) {
+        for (Entity entity : entities) {
+            if (EntitySystem.filter(entity, PositionComponent.ID, RotationXYComponent.ID, VelocityComponent.ID)) {
+                final Vector3d position = entity.position().position();
+                final Vector2d rotation = entity.rotation().rotation();
+                final Vector3d velocity = entity.velocity().velocity();
+                MathUtil.moveRelative(velocity.x(), velocity.y(), velocity.z(), rotation.y(), movement);
+                position.add(movement);
+                velocity.mul(0.5, 0.5, 0.5);
+            }
+        }
+    }
+}
diff --git a/modules/io.github.xenfork.freeworld.core/src/main/java/module-info.java b/modules/io.github.xenfork.freeworld.core/src/main/java/module-info.java
index 77d9ebb..96317f5 100644
--- a/modules/io.github.xenfork.freeworld.core/src/main/java/module-info.java
+++ b/modules/io.github.xenfork.freeworld.core/src/main/java/module-info.java
@@ -23,6 +23,7 @@
     exports io.github.xenfork.freeworld.world.chunk;
     exports io.github.xenfork.freeworld.world.entity;
     exports io.github.xenfork.freeworld.world.entity.component;
+    exports io.github.xenfork.freeworld.world.entity.system;
 
     requires ch.qos.logback.core;
     requires ch.qos.logback.classic;