The two main issues I found with the balancing were the fact you had way too much health, and the fact you could shot any weapon as fast as you wanted to by just spamming left click. I think you could balance that by making the weapon time a bit higher and buffing some of them, but adding a set firerate to each one.
The shotgun could pretty much obliterate everything if you clicked fast enough which felt really unbalanced, so, for example, buffing its damage but making it shoot considerably slower could be good. Though, to be honest, I find balancing shotguns the hardest thing to do in a game (speaking from experience lol)
Those are really the only things I found a little bit unbalanced, the rest of the game is really fun and the art is very cute!
