Not at all my kind of game (and not only because I am absolutely trash at it), but this is too well executed to not love. And that's not even touching on how amazing the use of the theme is (the little spinning wheel to fire, the spinning slots for perks, the spinning coin for revivals, just wow).
If I have some criticism, it's that I don't know that slowing down and speeding up the weapon seemed to do much. I got that for some of the other weapons it mattered more, but with the starting gun I just found it most beneficial to have it on the highest speed all the time since it dealt more damage too. Even in the early game (and even with how bad I played), it just didn't feel worth it to have it going slow. I felt like maybe I was missing something to that mechanic.
That's really me digging to find some feedback though. This is so polished for a jam game. And I would love to see you continue to develop this mechanic. It's all too good.