tweak colors a bit

src/bin/flappy/main.rs

@@ -117,7 +117,7 @@ fn init_bird(
 ) {
     let material = MeshMaterial2d(materials.add(ColorMaterial {
         texture: Some(server.load("kenny.nl/1-bit-platformer-pack/tile_0380.png")),
-        color: BLACK.into(),
+        color: ORANGE.into(),
         alpha_mode: AlphaMode2d::Blend,
         ..default()
     }));
@@ -182,7 +182,7 @@ fn init_obstacles(
     let pipe = {
         let material = MeshMaterial2d(materials.add(ColorMaterial {
             texture: Some(server.load("kenny.nl/1-bit-platformer-pack/tile_0247.png")),
-            color: BLACK.into(),
+            color: GREEN.into(),
             ..default()
         }));