From the moment I saw that banner I was intrigued. The aesthetics are dead simple, and that's all it needs. The guns feel punchy and the way enemies exploded into fragments was satisfying. The main mechanic forced quick and snappy gameplay, in a good way.
On to the bad: The floor really should be infinite. Enemies seem to come at you from all directions, which isn't quite fair when you don't know they're coming behind you. I was confused what gave me health (killing enemies?), an indicator would be nice (to help stupid people like me :P).
Overall, I really liked this one. I'm interested to see more of what you do!