LOVE the new levels!
One small suggestion for any future stuff: Cosmic Growl had parts where you'd go over lots of humps and down curves, and I think the actual line and speed went a little too close to the curvature of the ground blocks. For example, the spike on top after the vertical section in the beginning feels wonky; in a physically accurate world there would be some deceleration, and the cube would 'slow down' in a sense before coming to the spike. If you're not going for the physically accurate feel then disregard, just an intuition thing to help the sightreading a bit.