That's a very cool setting! As a platformer, the view feels too "zoomed in" and it's very hard to see what's in advance. The jump also feels too heavy and I constantly get damaged by spikes. And the main attack running out is problematic as it "locks" the player without any way to defend for the rest of the level. I'd add a short and weak melee attack so the player can break ammo crates and occasionally even defend off of enemies. The effort is there though, and the setting easily makes this platformer have more charm that most other I've tried. Keep up the good work!