Nice mix, the idea is super interesting. I would love to play a full-lenght game with this mechanics!
I felt like the game lacked some music, especially in the rythm attacks section, and I think that there should be some kind of indication to show if you hit the buttons in time or not.
I also feel like the game could benefit from a tutorial that explains how the attack mechanincs affect the damage dealt.
Overall, I really liked the concept, the art style and the graphics!
Hope you keep working on the game and expand this idea even further :)