These were some fun mechanics! The physics felt smooth, and the blend of minimalist graphics and color-changing was great!
The main bug that I ran into was that the music randomly blared and then cut out entirely (not sure if this is a web-only thing or not). Also, the way some of the obstacles were designed, it was sometimes difficult to track my trajectory and control my momentum. Though I bet with more time I could improve my skills, which is a mark of pretty good design.
Great entry! I had a fun time.