I didn't see any credits, so I'm gonna assume, that you did everything yourself. The music, sounds and visuals are super cool. The idea of trading stats is also really good for this theme.
My critique is that the gameplay gets stale quite fast, because I can just win at the game by running in a big circle and shoot towards the middle. Also some of the text was kind of blurry / low resolution on my screen.
Other than that, it is an awesome game, the particle effects are really cool and I liked how I could combine the infinite bonus with the shotgun bonus. Amazing job overall :)