While it's nice that there is someone working on it, it kinda disappoints me that it moving toward settling on the classic touhou approach. It would be awesome if we got more interesting mechanics than dodging little circles and shooting at bosses. I can think of several things on how to make this more interesting and allow it to be more rhythm based.
How about polygon shapes that mappers can make transform to the music? You would need to dodge those shapes, but also allow to press buttons to change color to dodge things by going through them like in undertale? How about things popping into existence on the location you currently are standing on at every beat to require you to move?