Wow this is very smart lol. Very good art, too. It seems like you did this solo, which is VERY impressive. The idea of moving using your gun is implemented a lot in other games, but you implemented it here so well i have to give you credit! Such great work. Audio is okay in my opinion, but something feels off about it, like it's kinda rushed...
Suggestion: Maybe give us more bullets to work with? That's the only idea i got. The game's quite good.
Onto the numbers:
Art: 8/10
Music: 6.5/10
Implementation of mechanics: 9/10
Theme: 9/10
Great work man! Keep it up! I'd love to see this game post-jam.