I will try to see if I can fix for the future the problems with physics with a material. I kind of relied too much on the rigidbodies and got punished for newbie errors. I was tinkering with other level designs but as I got the idea of having only 'one-screen' puzzles this got more difficult, but I agree completely on challenging the player on the order of actions. I tried that in the two later levels, but it could be better. Thanks for taking the time to analyze a bit!