technically functional, just looks very bad.

src/bin/flappy/main.rs

@@ -110,7 +110,7 @@ fn main() {
 fn tweak_camera(camera: Single<(Entity, &mut Camera)>, mut commands: Commands) {
     debug!("Tweaking camera");
     let (e, mut c) = camera.into_inner();
-    c.clear_color = ClearColorConfig::Custom(WHITE.into());
+    c.clear_color = ClearColorConfig::Custom(DEEP_SKY_BLUE.into());
     commands.entity(e).insert(ColorGrading { ..default() });
 }
 
@@ -440,14 +440,14 @@ fn init_assets(
 
     ground_assets.material = MeshMaterial2d(materials.add(ColorMaterial {
         texture: Some(server.load("flappy/ground.png")),
-        color: BLACK.into(),
+        color: Srgba::new(0.9, 0.9, 0.9, 1.0).into(),
         ..default()
     }));
     ground_assets.mesh = Mesh2d(meshes.add(Rectangle::new(1.0, 1.0)));
 
     ceiling_assets.material = MeshMaterial2d(materials.add(ColorMaterial {
         texture: Some(server.load("flappy/ceiling.png")),
-        color: BLACK.into(),
+        color: Srgba::new(0.9, 0.9, 0.9, 1.0).into(),
         ..default()
     }));
     ceiling_assets.mesh = Mesh2d(meshes.add(Rectangle::new(1.0, 0.777)));
@@ -709,35 +709,37 @@ fn init_background(
     {
         let material = MeshMaterial2d(materials.add(ColorMaterial {
             texture: Some(server.load("flappy/background-city.png")),
-            color: BLACK.into(),
+            color: Srgba::new(0.3, 0.3, 0.3, 1.0).into(),
             alpha_mode: AlphaMode2d::Blend,
             ..default()
         }));
         let mesh = Mesh2d(meshes.add(Rectangle::new(1.0, 1.0)));
-        let t = Transform::from_xyz(0.0, 0.0, -32.0).with_scale(Vec3::splat(650.0));
-        commands.spawn((ParallaxDepth(4.0), mesh, material, t));
+        {
+            let t = Transform::from_xyz(-325.0, 0.0, -32.0).with_scale(Vec3::splat(650.0));
+            commands.spawn((ParallaxDepth(4.0), mesh.clone(), material.clone(), t));
+        }
+
+        {
+            let t = Transform::from_xyz(325.0, 0.0, -32.0).with_scale(Vec3::splat(650.0));
+            commands.spawn((ParallaxDepth(4.0), mesh.clone(), material.clone(), t));
+        }
     }
     {
         let material = MeshMaterial2d(materials.add(ColorMaterial {
             texture: Some(server.load("flappy/background-clouds.png")),
-            color: BLACK.into(),
-            alpha_mode: AlphaMode2d::Blend,
-            ..default()
-        }));
-        let mesh = Mesh2d(meshes.add(Rectangle::new(1.0, 1.0)));
-        let t = Transform::from_xyz(0.0, 0.0, -64.0).with_scale(Vec3::splat(650.0));
-        commands.spawn((ParallaxDepth(8.0), mesh, material, t));
-    }
-    {
-        let material = MeshMaterial2d(materials.add(ColorMaterial {
-            texture: Some(server.load("flappy/background-gradient.png")),
-            color: BLACK.into(),
+            color: Srgba::new(0.2, 0.2, 0.2, 1.0).into(),
             alpha_mode: AlphaMode2d::Blend,
             ..default()
         }));
         let mesh = Mesh2d(meshes.add(Rectangle::new(1.0, 1.0)));
-        let t = Transform::from_xyz(0.0, 0.0, -128.0).with_scale(Vec3::splat(650.0));
-        commands.spawn((ParallaxDepth(16.0), mesh, material, t));
+        {
+            let t = Transform::from_xyz(-325.0, 0.0, -64.0).with_scale(Vec3::splat(650.0));
+            commands.spawn((ParallaxDepth(8.0), mesh.clone(), material.clone(), t));
+        }
+        {
+            let t = Transform::from_xyz(325.0, 0.0, -64.0).with_scale(Vec3::splat(650.0));
+            commands.spawn((ParallaxDepth(8.0), mesh.clone(), material.clone(), t));
+        }
     }
 }