The game is really fun and addictive! The visuals and sounds feel very polished. I also think that “stand to shoot” (although frustrating at first) is a good fit for the bullet hell gameplay.
I don’t really understand the upgrade system. You get a ton of different options, but only a limited number of slots which means that after some time you won’t be scaling as much. And the row of selected upgrades also keeps randomly changing sometimes. And when you die, I think you just restart at the same place with all your upgrades. Kinda confused about that as well.
Nevertheless, I think this game has a lot of potential. Great job!