I will start for the most important part according to you: the music. It's good. It's fun.
But that's where my issues start with the game. It's an experience, about the music, should I understand? I noticed the elements (like the platform) changed with time, but I did not understand what to do, because the game doesn't explain what it's about or what should I expect from playing it. So it makes me question if this is a way to showcase the music, which nice, but I fail to connect both things, as, as I've explained, the game doesn't tell us why things happen or what are we supposed to do. Just jump and fall? Just wait for the game to change? Just jump or just fall?
It was a weird experience overall. But it's not a complete bad experience nor a complete good experience.