It's a good attempt, but there is not much at the moment and its hard to guess what exactly are you going to add/change.
My suggestions:
- make enemies appear on the edge of a zone, not in the middle. A few times they appeared right in the way of a bullet already in the air :)
- add weapons, duh
- add more enemy types, duh!
- add HP for enemies, or some types of enemies
- make everything slightly bigger scale - at the moment there is no aim, just lucky shots and not lucky - everything is too small and fast to actually do something intellectual
- add some barriers in the level - no cover just means easier kills, especially since enemies are just shooting directly at where player is, not to where he is moving to
- add story. The game has intriguing name, but it doesn't head anywhere. Why is it called that way? Explain it in game. But don't be too upfront - make people guess a little.
All the best to you!