diff --git a/src/Apps/GameDesktop/Game.cs b/src/Apps/GameDesktop/Game.cs
index 09ce3ad..45428a7 100644
--- a/src/Apps/GameDesktop/Game.cs
+++ b/src/Apps/GameDesktop/Game.cs
@@ -11,6 +11,7 @@
 using Microsoft.Xna.Framework.Graphics;
 using Scellecs.Morpeh;
 using Serilog;
+using Systems.Debugging;
 
 namespace GameDesktop;
 
@@ -22,6 +23,8 @@ public class Game : Microsoft.Xna.Framework.Game
     private ImGuiRenderer _guiRenderer;
     private SpriteBatch _spriteBatch;
 
+    private SystemsGroup _debugSystemsGroup;
+
     // TODO: Frames updating
 
     // https://gafferongames.com/post/fix_your_timestep/
@@ -45,6 +48,9 @@ protected override void Initialize()
         _container.RegisterSingleton(_ => new SpriteBatch(GraphicsDevice));
         _spriteBatch = _container.GetInstance<SpriteBatch>();
 
+        _guiRenderer = new(this);
+        _guiRenderer.RebuildFontAtlas();
+
         _logger.ForContext<Game>().Verbose("SpriteBatch initialized");
 
         base.Initialize();
@@ -68,6 +74,11 @@ protected override void LoadContent()
         var dummy = _container.GetInstance<DummyEntity>();
         dummy.Create(@in: world);
 
+#if DEBUG
+        _debugSystemsGroup = world.CreateSystemsGroup();
+        _debugSystemsGroup.AddSystem(new EntitiesList(world));
+#endif
+
         _logger.ForContext<Game>().Verbose("LoadContent(): end");
     }
 
@@ -108,6 +119,7 @@ private void LateUpdate(GameTime gameTime)
 
     protected override void Draw(GameTime gameTime)
     {
+        float deltaTime = (float)gameTime.ElapsedGameTime.TotalSeconds;
         GraphicsDevice.Clear(Color.CornflowerBlue);
 
         base.Draw(gameTime);
@@ -115,7 +127,7 @@ protected override void Draw(GameTime gameTime)
 #if DEBUG
         _guiRenderer.BeginLayout(gameTime);
 
-        ImGui.Text("Hi!");
+        _debugSystemsGroup.Update(deltaTime);
 
         _guiRenderer.EndLayout();
 #endif
diff --git a/src/Libs/Systems.Debugging/EntitiesList.cs b/src/Libs/Systems.Debugging/EntitiesList.cs
index 41575bc..831f847 100644
--- a/src/Libs/Systems.Debugging/EntitiesList.cs
+++ b/src/Libs/Systems.Debugging/EntitiesList.cs
@@ -23,6 +23,7 @@ public void OnUpdate(float deltaTime)
 
         foreach (Entity e in filter)
         {
+            ImGui.Text(e.ToString());
         }
     }