I really liked that game, and I didn't think I would based on screenshots.
The gameplay is really cool, although I have a couple of complaints:
- music bacame really tiring really fast, maybe a mute button would be cool?
- sound effects are pretty nice, but also pretty repetitive, some variations of the same sounds wouldn't hurt
- sometimes, if I shot directly to a wall in front of me, the bullets would just dissapear (maybe colliding with the player?)
Overall it was a pretty fun experience :)