Eyes hurt after playing too long but perfect execution as a GMTK submission: Simple, yet elegant, one mechanic serving multiple different roles, difficult but not impossible, AND integration of music and rhythm into a tried and true genre. Mark Brown will love this, ticks all the boxes. I'd be surprised if it's not in his follow-up video on the Jam.
Flashing lights are a bit much but that is the only negative I have. Very well done