diff --git a/level/geometry/environment.tres b/level/geometry/environment.tres
index ac118237..1612b8d3 100644
--- a/level/geometry/environment.tres
+++ b/level/geometry/environment.tres
@@ -1,7 +1,15 @@
-[gd_resource type="Environment" format=2]
+[gd_resource type="Environment" load_steps=2 format=2]
+
+[sub_resource type="ProceduralSky" id=1]
+sky_top_color = Color( 0.65098, 0.498039, 0.356863, 1 )
+sky_horizon_color = Color( 0.101961, 0.0784314, 0.054902, 1 )
+ground_bottom_color = Color( 0.101961, 0.0784314, 0.054902, 1 )
+ground_horizon_color = Color( 0.101961, 0.0784314, 0.054902, 1 )
+sun_energy = 0.0
 
 [resource]
 background_mode = 1
+background_sky = SubResource( 1 )
 ambient_light_color = Color( 0.258824, 0.203922, 0.152941, 1 )
 ambient_light_sky_contribution = 0.0
 fog_enabled = true
diff --git a/level/level.gd b/level/level.gd
index 405744b0..64ab038e 100644
--- a/level/level.gd
+++ b/level/level.gd
@@ -8,13 +8,25 @@ signal replace_main_scene # Useless, but needed as there is no clean way to chec
 onready var world_environment = $WorldEnvironment
 
 func _ready():
-	if Settings.gi_quality == Settings.GIQuality.HIGH:
+	if OS.get_current_video_driver() == OS.VIDEO_DRIVER_GLES3 and Settings.gi_quality == Settings.GIQuality.HIGH:
 		ProjectSettings["rendering/quality/voxel_cone_tracing/high_quality"] = true
-	elif Settings.gi_quality == Settings.GIQuality.LOW:
+	elif OS.get_current_video_driver() == OS.VIDEO_DRIVER_GLES3 and Settings.gi_quality == Settings.GIQuality.LOW:
 		ProjectSettings["rendering/quality/voxel_cone_tracing/high_quality"] = false
 	else:
+		# GLES2 fallback only supports ReflectionProbe, not GIProbe.
+		# However, ReflectionProbes don't blend well with environment lighting in GLES2,
+		# so it looks better (and performs better) when ReflectionProbes are also hidden.
 		$GIProbe.hide()
-		$ReflectionProbes.show()
+		if OS.get_current_video_driver() == OS.VIDEO_DRIVER_GLES3:
+			$ReflectionProbes.show()
+		else:
+			$ReflectionProbes.hide()
+			# Brighten level if falling back to GLES2, as it looks very dark otherwise.
+			# A procedural sky is used to provide ambient and reflected lighting as a fallback.
+			world_environment.environment.background_mode = Environment.BG_SKY
+			world_environment.environment.ambient_light_sky_contribution = 1.0
+			# Adjust glow strength for GLES2 (since there is no HDR).
+			world_environment.environment.glow_strength = 1.5
 
 	if Settings.aa_quality == Settings.AAQuality.AA_8X:
 		get_viewport().msaa = Viewport.MSAA_8X
diff --git a/menu/menu.gd b/menu/menu.gd
index f6f02f2e..7cc90b2c 100644
--- a/menu/menu.gd
+++ b/menu/menu.gd
@@ -8,6 +8,7 @@ signal replace_main_scene
 signal quit # Useless, but needed as there is no clean way to check if a node exposes a signal
 
 onready var ui = $UI
+onready var gles2_fallback = ui.get_node(@"GLES2Fallback")
 onready var main = ui.get_node(@"Main")
 onready var play_button = main.get_node(@"Play")
 onready var settings_button = main.get_node(@"Settings")
@@ -54,6 +55,12 @@ onready var loading_progress = loading.get_node(@"Progress")
 onready var loading_done_timer = loading.get_node(@"DoneTimer")
 
 func _ready():
+	if OS.get_current_video_driver() == OS.VIDEO_DRIVER_GLES2:
+		gles2_fallback.visible = true
+		# GI and SSAO are not supported in GLES2.
+		gi_menu.visible = false
+		ssao_menu.visible = false
+
 	get_tree().set_screen_stretch(SceneTree.STRETCH_MODE_2D, SceneTree.STRETCH_ASPECT_KEEP, Vector2(1920, 1080))
 	play_button.grab_focus()
 	var sound_effects = $BackgroundCache/RedRobot/SoundEffects
diff --git a/menu/menu.tscn b/menu/menu.tscn
index 4031b1b2..cbc48ee4 100644
--- a/menu/menu.tscn
+++ b/menu/menu.tscn
@@ -200,6 +200,18 @@ __meta__ = {
 "_edit_use_anchors_": false
 }
 
+[node name="GLES2Fallback" type="Label" parent="UI"]
+visible = false
+margin_left = 97.9495
+margin_top = 200.0
+margin_right = 837.949
+margin_bottom = 253.0
+custom_colors/font_color = Color( 1, 0.870588, 0.356863, 1 )
+text = "GLES2 fallback (degraded graphics quality)"
+__meta__ = {
+"_edit_use_anchors_": false
+}
+
 [node name="Main" type="Control" parent="UI"]
 anchor_left = -0.000673103
 anchor_top = -0.00189865
diff --git a/player/bullet/bullet.tscn b/player/bullet/bullet.tscn
index 0a602c8f..fa26d9a7 100644
--- a/player/bullet/bullet.tscn
+++ b/player/bullet/bullet.tscn
@@ -1,4 +1,4 @@
-[gd_scene load_steps=63 format=2]
+[gd_scene load_steps=57 format=2]
 
 [ext_resource path="res://player/bullet/bullet.gd" type="Script" id=1]
 [ext_resource path="res://effects_shared/BlastMesh_Sphere.mesh" type="ArrayMesh" id=2]
@@ -373,26 +373,6 @@ scale_curve = SubResource( 40 )
 radius = 0.3
 height = 0.6
 
-[sub_resource type="Gradient" id=43]
-colors = PoolColorArray( 1, 1, 1, 1, 1, 1, 1, 0 )
-
-[sub_resource type="GradientTexture" id=44]
-gradient = SubResource( 43 )
-
-[sub_resource type="Curve" id=45]
-max_value = 4.0
-_data = [ Vector2( 0.150987, 4 ), 0.0, 0.0, 0, 0, Vector2( 1, 0.6936 ), 0.0, 0.0, 0, 0 ]
-
-[sub_resource type="CurveTexture" id=46]
-curve = SubResource( 45 )
-
-[sub_resource type="ParticlesMaterial" id=47]
-spread = 180.0
-gravity = Vector3( 0, -1, 0 )
-scale = 0.3
-scale_curve = SubResource( 46 )
-color_ramp = SubResource( 44 )
-
 [sub_resource type="SpatialMaterial" id=48]
 flags_transparent = true
 vertex_color_use_as_albedo = true
@@ -411,32 +391,12 @@ height = 0.2
 radial_segments = 5
 rings = 3
 
-[sub_resource type="Gradient" id=50]
-colors = PoolColorArray( 1, 1, 1, 1, 0, 0.0313726, 0.501961, 0.752941 )
-
-[sub_resource type="GradientTexture" id=51]
-gradient = SubResource( 50 )
-width = 128
-
-[sub_resource type="Curve" id=52]
-_data = [ Vector2( 0, 0 ), 0.0, 0.0, 0, 0, Vector2( 0.417722, 1 ), 0.0, 0.0, 0, 0, Vector2( 1, 0 ), 0.0, 0.0, 0, 0 ]
-
-[sub_resource type="CurveTexture" id=53]
-width = 128
-curve = SubResource( 52 )
+[sub_resource type="Curve" id=45]
+max_value = 4.0
+_data = [ Vector2( 0.150987, 4 ), 0.0, 0.0, 0, 0, Vector2( 1, 0.6936 ), 0.0, 0.0, 0, 0 ]
 
-[sub_resource type="ParticlesMaterial" id=54]
-emission_shape = 1
-emission_sphere_radius = 0.1
-flag_align_y = true
-direction = Vector3( 0, 0, -1 )
-spread = 0.0
-gravity = Vector3( 0, 0, 0 )
-initial_velocity = 9.0
-damping = 9.0
-scale = 0.3
-scale_curve = SubResource( 53 )
-color_ramp = SubResource( 51 )
+[sub_resource type="Gradient" id=43]
+colors = PoolColorArray( 1, 1, 1, 1, 1, 1, 1, 0 )
 
 [sub_resource type="SphereMesh" id=55]
 radius = 0.05
@@ -444,6 +404,12 @@ height = 0.3
 radial_segments = 4
 rings = 4
 
+[sub_resource type="Curve" id=52]
+_data = [ Vector2( 0, 0 ), 0.0, 0.0, 0, 0, Vector2( 0.417722, 1 ), 0.0, 0.0, 0, 0, Vector2( 1, 0 ), 0.0, 0.0, 0, 0 ]
+
+[sub_resource type="Gradient" id=50]
+colors = PoolColorArray( 1, 1, 1, 1, 0, 0.0313726, 0.501961, 0.752941 )
+
 [node name="Bullet" type="KinematicBody"]
 collision_layer = 0
 script = ExtResource( 1 )
@@ -453,7 +419,6 @@ transform = Transform( 0.1, 0, 0, 0, 0.1, 0, 0, 0, 0.1, 0, 0, 0 )
 visible = false
 cast_shadow = 0
 mesh = SubResource( 1 )
-material/0 = null
 
 [node name="OmniLight" type="OmniLight" parent="."]
 light_color = Color( 0, 1, 0.952941, 1 )
@@ -537,21 +502,34 @@ draw_pass_1 = SubResource( 42 )
 visible = false
 material_override = ExtResource( 4 )
 mesh = ExtResource( 2 )
-material/0 = null
 
 [node name="BulletBody" type="Spatial" parent="."]
 
-[node name="MainBody" type="Particles" parent="BulletBody"]
+[node name="MainBody" type="CPUParticles" parent="BulletBody"]
 transform = Transform( 1, 0, 0, 0, 1, 0, 0, 0, 1, -0.00988865, 0, 0 )
 amount = 100
 lifetime = 0.1
 local_coords = false
-process_material = SubResource( 47 )
-draw_pass_1 = SubResource( 49 )
+mesh = SubResource( 49 )
+spread = 180.0
+gravity = Vector3( 0, -1, 0 )
+scale_amount = 0.3
+scale_amount_curve = SubResource( 45 )
+color_ramp = SubResource( 43 )
 
-[node name="Trail" type="Particles" parent="BulletBody"]
+[node name="Trail" type="CPUParticles" parent="BulletBody"]
 material_override = ExtResource( 9 )
 amount = 10
 local_coords = false
-process_material = SubResource( 54 )
-draw_pass_1 = SubResource( 55 )
+mesh = SubResource( 55 )
+emission_shape = 1
+emission_sphere_radius = 0.1
+flag_align_y = true
+direction = Vector3( 0, 0, -1 )
+spread = 0.0
+gravity = Vector3( 0, 0, 0 )
+initial_velocity = 9.0
+damping = 9.0
+scale_amount = 0.3
+scale_amount_curve = SubResource( 52 )
+color_ramp = SubResource( 50 )
diff --git a/project.godot b/project.godot
index 2b770c7b..da56bd45 100644
--- a/project.godot
+++ b/project.godot
@@ -217,6 +217,7 @@ toggle_debug={
 
 [rendering]
 
+quality/driver/fallback_to_gles2=true
 vram_compression/import_etc2=false
 quality/shadow_atlas/size=2048
 quality/filters/msaa=2