Hey, glad to see you got it working! I love the art style, it reminds me of something but idk what. It plays very smoothly, I didn't find any collision bugs. Some quite creative puzzles given the simplicity of the level elements! I also enjoyed how long the levels were.
I actually found it was easier to just not use the gun and avoid the enemies, than it was to worry about where the recoil would send me.
I'd also suggest some different controls as I found these ones quite awkward. I would have used W for jump and space to shoot. Or if space has to be jump, shift could have been shoot too.
Overall, great entry!
PS: I let the enemy sleeping in the neon gates be. He looked so peaceful. Although I bumped into hm by accident, he didn't wake up so I hope he slept ok.