I built the greatest level, then accidentally hit quit, which immediately closed everything, please press F to pay respects.
I also had the camera movement bug, until I played my first level, I couldn't move the camera. Otherwise I think it's a neat gameplay concept. I think it might need a bit of a "hook" to motivate people to keep playing, else it might run into the trap a lot of games banking on the player's creativity fall in and get boring fast after the initial burst of creativity runs out. Though I guess it's alpha 0.0.0.0, so I'm sure you still have a lot of things planned already.