It was fun and I enjoyed the concept a lot. I think that some of the physics are a little wonky though. I had problems doing something like walking off an edge even on the second level.
I feel like this shouldn't be hard to do. I'm not sure what I was expecting to happen though. I think when I walk off the edge I was expecting to have gravity pull me to the right, not up suddenly. Maybe gravity should start pulling you to the closest surface towards the center?