Really good game! It's fun to play, and it feels like it has a lot of content. I like that each gun feels a little different and requires a slightly different playstyle.
I think the camera should be MUCH further zoomed out, like maybe even twice as far out as it is now. Ideally, if an enemy can shoot me and I can shoot them, I'd like it if they were either visible or at least pretty close to the screen's edge most of the time.
I also thought it might be nice if the character moved just a tiny bit faster, because I felt that too much difficulty just came from not being able to get out of the way of bullets fast enough. Rolling helps, but I think it would have been less frustrating with even just 10% faster movement or something. Idk.
Nice work. I thought this was a lot of fun, and the boss was a good challenge!