A nice little game, well done. Nice use of filters and whatnot to give it that unique aesthetic, and the simple music works nicely too! My only criticism is that the bullets blend into the background, so it might've been nice to see a trail or something.
All in all, good stuff :)
We also made a game about ricocheting bullets to kill all enemies xD https://itch.io/jam/gmtk-2019/rate/462793