One of the more challenging "scaling puzzles" I've seen this jam, most likely cause I did not understand the controls fully. I had no idea you had a limited amount of scaling each level, and no mention of a reset button made me think the game was broken. It was out of pure habit I eventually pressed R on the second level and then realised why I hadn't been able to scale.
Also I though that "press 2 to scale" only meant to scale up from being small, so it took awhile before I could press it again to become even bigger. I got stuck on the level where you can push a cube on a ledge up with your head. Tried to make it into a stepping block I could stand on to reach higher but that didn't work so I eventually gave up.
The puzzles are good, just wish the controls and situation were explained a bit better.