I think the idea of recruiting a band player by player is a great idea and it works well as "Every new player adds to the length". Although, I would have preferred it if new players added difficulty instead. Like: You start with only two buttons for the guitar and every new player adds one or two more. But this works as well.
I loved the art, the characters and the location looked really cool. The notes might need a bit more polish (I see they are stretched instead of sliced). Also, the fonts can be a bit hard to read sometimes.
The music is pretty good and I love that the new players add one new layer to the song each.
Creative idea to combine a rhythm game with a visual novel. I think it works well.
Overall an awesome entry. Thou did a great job!