This concept is so interesting, but I think it lacks something currently. I felt like the only thing useful was the bouncing platforms, as everything dies after one loop and there is no jump (but maybe I misunderstood something). So basically I finished the game just by putting jumping platforms everywhere.
The concept is really interesting though, I had a similar concept once for a shootemup where you shoot on the beat, and my gmtk entry is an expansion on this concept but with a brotato-like gameplay. But I never thought about doing it for a platform game, that is really creative. And I think there is a lot that can be done to make it really fun.