I like the idea, and trying to go as fast as possible around the many corners is quite fun. I do think some obstacles could add a lot of depth, like maybe spider webs which slow you down or block that drop you or something like that. That way, the world could feel more alive and thus make replaying more fun. The last levels are quite large, and making them more challenging instead of just larger could be a good way to go. Anyway, just some ideas and feedback for the future.
Great work!