I love the concept so much!
It’s a little annoying having to switch between the mouse and the arrow keys every time you use an attack. I understand that weaker attacks are meant to be easier to use than the more powerful ones, but I always find the stronger attacks more fun, so I end up using the same ones over and over—not because they’re stronger, but because they just feel better to pull off.
I’d also appreciate a bit more feedback when you miss a note.
The music is great, I love the art, and I absolutely love the main mechanic!