Loved the aesthetics and the concept, and the fast pace fit really well. It would be cool to see more interactions between the different note types. I thought it was a bit strange that my attacks didn't auto-execute while the enemy's did - I get that you'd want the player to actively be juggling sending attacks with denying enemy attacks but maybe that could instead be balanced by having situations were you deliberately want to avoid attacking, like if the enemy has a counter-attack phase or something.
Anyway, great job!