Great demo! A good proof of concept with really great character designs and voicing. I'm impressed with your ability to get a rhythm game set up in Ren'Py!
That being said, as a person who is not great at rhythm games, I did see the Try Again screen a couple of times and the fact that it seem to kick you back to the start of the story did not feel great. (I thought when I messed up on the guessing witch vs princess it put me right back there, so I'm not sure if something else happened or what). Also your confirmation screen after try again seems switched with Yes putting you back on the main menu and No repeating the game.
I'm excited to see where you guys take this!