Omg the music every time I returned to the upgrade room made me soooo happy haha! This game is amazing lol The movement controls are my favourite part, it feels really intuitive. This game is really well made and the upgrades are awesome. My only gripe is waiting around for bullets to come back is a little tedious. Perhaps it would be interesting if some spawning randomly in the arena, that would incentivize me to move around more and collect them (whilst dodging incoming bullets).
Anyway great game. Good job :)