I like the idea, but the pace is a bit too chaotic and some things can become frustrating:
- some obstacles are way too big and come at you quickly, there's a very tiny chance of doing anything about it
- those enemies that attack you also deplete your ammo, rendering you unable to shoot
- the player bounces off the sides of the screen, which tends to be uncontrollable
Otherwise, I like it, especially the artwork. Keep up the good work!