// Animación de nave pequeña
atlas = new TextureAtlas(Gdx.files.internal("enemy/small.pack"));
ResourceManager.loadResource("small_enemy", new Animation(0.15f, atlas.findRegions("small")));
// Animación para la roca
atlas = new TextureAtlas(Gdx.files.internal("enemy/stone.pack"));
ResourceManager.loadResource("stone", new Animation(0.15f, atlas.findRegions("stone")));
ResourceManager.loadResource("pursuer_enemy", ResourceManager.createAnimationFromSpriteSheet("enemy/pursuer.png", 6));
ResourceManager.loadResource("shooter_enemy", ResourceManager.createAnimationFromSpriteSheet("enemy/shooter.png", 6));
ResourceManager.loadResource("big_enemy", ResourceManager.createAnimationFromSpriteSheet("enemy/big.png", 6));
ResourceManager.loadResource("missile", ResourceManager.createAnimationFromSpriteSheet("items/missile.png", 16));