Love your games, and this one is no exception. A nice little challenge that wastes no time.
It was more of a challenge for me as there is now a bug with pico-8 when playing on iOS, at least for my old iPhone, in that it can highlight the game as if it’s text when using the touch controls, so I had to chain presses of short durations or unselect the text after long presses.
I have to commend you for managing the arcane art of making compressible games.
Some random ideas for if it wasn’t so size limited:
1. A section where fully smooth travel is always possible, taking from a few preset waveforms, perhaps placed at the end.
2. Maybe improve the colours of the circles (all dark colours (no black) except for rainbow at the end, perhaps coloured by size).