This might have been my least favorite, unfortunately. I like the idea of it, but I think it would be better suited for proper platforming levels rather than a randomly-generated elevator.
This style of constantly sinking platforms is also very stressful and frustrating for me, and one of my least favorite types of platform level. I think the need to keep up with the beat is enough incentive for forward motion, especially if you changed it so that missing the beat killed you.
I'm also not terribly good at platformers or rhythm games, so take everything I said with a grain of salt.