Marvelous and distinguished game! The idea to combine music game qte with combat is defintely innovative! And here are some advice:
1. A Bug Exists lol : when I back to game from the credit page, the music stopped and i can't do the qte attack either. I also can't qiut the game since it lacks a quit bottom.
2. There is a certain phase offset between the music and the QTE . Add a System for calibration and increase the reaction time for QTEs will defintely improve the playing experience.
All in all , it's defintely a great innovation and a nice try. Wish to see your next version. :-)