Ah, a psychological cost of progress! me likely. It also is pretty weighty because this game gets hard without those upgrades. Good music, good feel. I would normally say calm the camera down and have it not follow the mouse, but in this game it actually provides a nice frantic feeling. The most important thing this game needs is feedback- damage sounds, the bullets impacting your character making it do a lil animations or something, same with the enemies- i would also like to see the character sprite change with each item addition.
Yeah, the game absolutely needs feedback. Due to no experience and limited time we abandoned a lot of improvements - we were focused on making an MVP, and that's what we did - nothing more. But reading these comments motivates us to keep working on this project.
About the changing character sprite - it was in our minds although considering whether to focus on core gameplay or better looks we chose to implement core gameplay first.