That was really fun! The note hitting was really satisfying, to the beat and just the right level of difficulty. Balancing of offence and defence through the ability to heal myself was a really nice way to make the game more interesting too. Criticism-wise, the game could use more than just 2 levels, the level select and save capabilities kind of made me expect it to be a lot longer than it actually was. Secondly, the bonus to damage and resistance is probably there, but it's not really communicated effectively. I genuinely could not tell, when I was upgrading my character - throwing in a little bit of 'juice' when the player powers up could a nice way to make the game more satisfying.