Nice game, the artword is great! I had a few issues though, heres some of my feedback:
-Sometiems when I died though I would be comfused because theres no death sound effect or animations to show when you died or when something is killing you. For example the spike that falls falls really quickly with no sound effect or particles once it hits the ground so I couldn't tell why I died, and the enemies kill me from quite far away, but there is no attack animation or sound effet so it confused me
-When I die from falling there is a platform just below so it feels like I have fallen onto something rather than into the void
-The shooting block feels a bit weak since the sound effect sound like a high piched tick
These really are just small details though. The movement and platforming felt really smooth and satisfying and there were a lot of great sound effects too, really well done on the atmosphee aswell. This game is very polished and made very well, good job :)