This was a fun arena survival game! It runs very well and everything seems to work. I like the different weapons. Each one has a use for different situations making unlocking new weapons feel good. Swapping between weapons also feels good for this reason. There's no delay so you get to use each weapon as the situation calls for it.
I can't really think of anything that needs to be changed. There's room for expansion though if you wanted to do that. If anything it was a bit easy, but that's not a bad thing for this style of game.
It's a really solid and fun experience. I liked rotting their bones with my giant lollipop. Great job!