A very fun and easy game to control but 2 problems:
1) i think your space ship is to small. If you make it bigger then the graphics are better. Then you should make the UFO and the asteroids bigger as well.
2) some times my ship tilt controller gets stuck and I can not tilt it.
P.S. To all players, if you go in the corner of the screen, and you stay there, it is a secret spot and you do not get hit!=)