I think your art is really cute! I like your character designs, your layout for the wintery scene, all very nice.
While I'm not super into rhythm games, I think it's a neat idea - like, old school pixel rpg, but instead of fading to a tactics battle, the battles are rythum, it's neat in an unexpected way :) Just be careful for like, slow baby players like me, who need some slow rhythm beats to start because my fingers can't move very fast xD;;