Pretty good game, it felt super satisfying getting a bunch of upgrades on one particular gun and seeing how they chain together (heh, chain lightning upgrade...) I will say, the screen shake for the rifle and SMG is a bit too much for me so I didn't use them as much as the shotgun. Also, tweaking the sound effects to have a slightly different random pitch to avoid audio fatigue does go a long way. Overall, you did pretty good :)