[ "Heating Up", medium difficulty ]
That was fun! The songs are killer, the concept is intriguing, and the mechanics are competently implemented.
The random colors definitely make for a trippy—sometimes abrasive—experience. I'm fine with computer games having caustic colors, but I think the algorithm could've used a little bit more bounding on how unfair the palette can be. At one point, it generated a palette that used two slightly-off shades of lime for the notes, which might be excessive.
It's a bit difficult to tell how far-off notes are arranged on the beat; some extra guiding lines (faded if need be) in each direction might be warranted.
All-in-all, good work!