The orchestral arrangements were incredible to listen to while trying to figure out the gameplay! Without separate controls for the two characters (ex: left-click for one, right-click for the other), it felt interestingly like one of those unusual "learn the controls" games (vaguely like I Am Bread), and started to pick up once I started to figure it out.
The gameplay aspect felt somewhat lacking in feedback and direction. I didn't have much of a sense of whether I was doing well or not, or what I was supposed to do next - something that I tend to see a lot more in rhythm games proper (such as osu! or Rift of the Necrodancer, if you're looking for references).
On the other hand, my attention was mostly occupied by the fun visual style and how the music complements that. What this game does well, it does incredibly well, and I enjoyed it as a result. Excellent work!