feat: add handcrafted 8x8 sprite art and VBlank bioluminescent animation for rotten apples

source/game_render.cpp

@@ -129,9 +129,10 @@ void draw_apples_rotten(const GameState &state, const RenderAssets &assets,
     if (oamId >= 128) {
       return;
     }
+    const bool hflip = (((apple.x + apple.y) & 1) != 0);
     oamSet(&oamSub, oamId, apple.x * 8, apple.y * 8, 0, 0, SpriteSize_8x8,
            SpriteColorFormat_256Color, assets.gfx_apple_rotten, -1, false,
-           false, false, false, false);
+           false, hflip, false, false);
     oamId++;
   }
 }