Having to switch out weapons every minute is a cool idea!
Visually the game felt kinda all over the place though. It felt like almost every different asset was in a different style. I don't know how many of the assets were free assets vs how many were made for this game, but there's a strong argument to be had that a game's overall visual cohesion is more important than the appearance of any individual asset. And making all your assets goes a long way to increasing cohesion (even if the individual assets aren't as good), plus you get more experience as an artist.
Otherwise really cool game, and well made.