The levels itself weren't too bad at all, but I had trouble lining up the characters because they kept falling off edges due to the physics. My personal recommendation is to lock the rotation of the physics objects but keep the gravity the same. Alternatively, you could have a harder and an easier mode where one has proper physics and the other is made easier by the lack of rotation. Anyway, great game, I enjoyed it regardless, even though the physics made it slightly frustrating.