Nice work
Certainly a nice fast pace game. If I might make a couple suggestions though, make the screen a bit bigger. The small space to move around in got a bit frustrating when you had so many bullets flying around at once. Also, holding z to fire makes the other buttons more difficult to hit in the middle of the action. Automatic or space bar would be more useful. I did like how you got ammo for the special powers randomly and automatically when you killed enemies. Overall, good job, though. Has great potential.