Interesting idea, and sound implementation. I tried quite a few times to make it to the end but in the end couldn't - but I think this is something a balancing pass would make into a really fun game. A few points:
- I could see the triangles were somehow flashing with the beat, but I could never quite tell where they were or what sounds they were reacting to. Perhaps these could be better telegraphed in some way.
- At one point I got stuck at a checkpoint for quite a long time as blue squares had stopped in a complete line in front of me and the checkpoint I was on was a stop movement. As I couldn't move left or right, I was just stuck.
Good job hitting all the diversifiers though and I think it really fits the themes/limitations. I think you do have something good here overall.