Fun and engaging concept. The music gets really energetic once it gets going.
Didn't seem like there was much of a point to the gravity switching. Every obstacle I encountered could be jumped over. Maybe I missed something, though, since I never found the exit portal.
Would have been nice if you could leave "breadcrumbs" that persisted between attempts, so that you could remember where you've already been. Maybe there could have been environmental clues as to where the exit portal was too (unless there already was and I missed them).