That was a lot of fun! I really liked the concept of using the beat as a way of guiding you through the level. And it made the last level with the empty space really satisfying when I actually got to the chamber thing at the end.
The only comment I have is that one of the levels (I think the second last one?) wasn't entirely synced with the music, so I had to improvise there.
But otherwise, this was really excellent, and really fun.