I think the blurring on your text in the menu might put you over the four color limit. Also, the rocks fall very quickly, and the gun takes a long time to recharge. I think it could be improved by adding more rocks, but having them fall slower, and giving the gun a faster recharge. Alternatively, the rocks could be stationary, making it a decision for the player how fast to fly through them, giving them more control. I like the animation on the flames and the stars, and the death animation for the ship is really nice!