Very simple game. Reminds me of old Atari games, which is good. The game is too hard from start. I would recommend you to ask your grand mother or grand father to test the game. If they can't finish the first level or stage, then the game is too hard.
Also I would like to be able to steer left and right, not just up and down. Finally the star field in the background just look weird. Why are the stars not going in the same direction?