A great rhythm entry! I like how the core of it was kept nice and simple with complexity given with the upgrades. I'm quite impressed with the inclusion of being able to replay your rhythm as well, and the game itself was responsive and felt good to play. Tutorial was well made, but I feel it could be improved by spacing information out by giving the player time to test mechanics introduced - for me it was a little bit of too much information at once and a lot of it ended up being me figuring things out as I went. Game was also quite artistically clean and consistent, I think there's lots you can do with this post jam.
Great work! Rhythm games are not easy to make especially for a jam :)