This game looks great. The setting / bg and animations are really well done. My feedback for the gameplay is that maybe the enemies should be 1-hit-able, because it's a little frustrating to have to hit them multiple times to kill them, so I end up mostly just dodging whenever I can.
I get that would remove the idea of different bullets having different strengths, but it feels like that feature is there to tie it to the theme more than to enhance gameplay. Although that's just my opinion.
On the positive side, like I said, it looks great. Parallax effect is a nice touch. And it's fun too. Overall it's def a pretty solid submission.