Really cool game! Though personally I feel that the combo system needs to be tweaked a bit. I'm used to playing a lot of rhythm games, and I thought the way combo systems worked is to count the amount of consecutive notes that you've hit?
Other than that, agreed with what GDeavid has said, it feels odd to play a rhythm game without rhythm. If some custom maps are made for some of the music, I'd like to play this again! Congrats on finishing for the jam btw.