The graphics are so fun and the custom music is pretty great for this. I thought the placement of the beats was pretty good too.
I think having only color be the distinguishing factor could be isolating to some players (especially since the food they carry kind of reduces the color distinction). I had some issue myself and would have preferred for example if the different fairy types had different vertical position on the screen.
The sound of stuff falling into the pot is an offset timing from the music and the player's input, and it creates kind of a false rhythm separate from the correct one. Just reducing the volume on that sound I think would help.
"Press any key to start" doesn't respond to most keys, which honestly seems to be a gaming tradition but please XD