Hey!
First of all, congrats for finishing the game! It was a fun to play it, I love the music, the sound effects, the art, everything is on point. It's really awesome to see a game like this.
If you need some feedback, here's mine: I found odd how you can collide with your own bullets, and also it was very weird how the enemies are spawning behind the wall (on the gray surface) and they shoot you, but you can't shoot them because my bullets collide with the wall, so there was no way to kill them.
Other than that, I think you did an amazing job, congrats!
I would love to have you playing mine too, if you don't mind of course! ^_^