Woah, I was really impressed by some of these puzzles! I often went for the obvious solution, before discovering it was wrong, which is brilliant design! I do believe tho that one of the levels is bugged and unbeatable? The level where it says 'Ice is harder to break', the block directly to the right of the word ice won't fall even after being stood on, and if you approach from the opposite direction, you can step onto the block, but not get off it? I'm 99% sure that's a glitch, and that the level can't be beaten, which makes me sad =(
Really cool puzzle game, it made me think about the different possibilities, and it was amazing how you could logically reason out even the larger, more abstract levels! Only other thing I'd ask for is a faster rewind or ability to straight up restart the level.