Great upgrades system, though when I picked up exploding bullets the firerate went crazy up.
Also, I would have preferred if the camera was a bit more zoomed out, so that I could see more of the level.
Thanks for playing and the feedback and I totally agree with the camera, that was one thought that popped up while I was developing the game but unfortunately I never implemented it. That bug you mentioned was interesting about the firerate going up, never a bug I encountered during development or playtesting, though thanks for bringing it to my attention!