I love this. The idea of only moving using the recoil of your weapon is one I really like (I've made a platformer like that before and it's really fun to work with.) The sound effects are really satisfying, especially when you grab the minigun upgrade and use it with the shotgun. Would like to have seen the minigun rocket launcher, but I can see how that would have been game crashing. The game would probably benefit from having a custom cursor since I found myself scrambling to find my mouse when trying to switch weapon (alternatively, being able to switch with number keys would also work.) Incredible entry, great job!