This is fantastic. I mean first off that mechanic is ssooo clever. Bullet hells are always fun, but the added complexity of indirectly controlling a physics object that's your only source of damage? That's awesome.
Fitting the theme perfectly with each number having its own totally unique playstyle. I think 2 is my favourite, that one feels particularly fun to control and would make a great standalone game.
If I had to give critique, I'm say the player movement controller could use refining. Check out this fantasic video by Tarodev
Great game, really enjoyed that.