It's easy to avoid the bullets by moving in a circular pattern around the edges of the level. I got to level 7 before I committed suicide after becoming bored. I suggest different types of enemies with patterns that are not so predictable.
simple, but efficient.
Pretty cool but short games ^^. The only bad points are (for me) a kind of heavy spaceship to control and the lack of music or sounds :/. Except that I had really enjoys this little moment espiecally after finding a way to be sure to doge every bullets :).
The levels have nothing new in them just pasted more of the same enemy in it.