I liked the artwork. Everything fit the theme really well.
I found the collision a little confusing at times. A few bullets seemed to pass through me, and one of the swordfish enemies got stuck attacking from the bottom left. I also think some health indicators, hit animations, and death animations would make the game feel even better.
One small suggestion is to make the enemies a little smaller, so you can fit even more on screen and cause me even more pain.
Overall, it was a fun little bullet hell game.