Very cool game, I loved every seconds of it, even when I struggle at something. I think you could have improved the room with the green box, the X mark on the ceiling, and green wall behind. Make it in a way that the player has to look at the wall when they are placing down the green block. That way, the player can see that there's a wall being activated by the button. You provided a small hole though, so I can't really say that you didn't think about that. Also at the last level, I was too dumb and forgor that sprinting was a thing. Probably it would have been a lot easier for casual players if you disable movement controls in the air - let momentum do the work!
Other than these, everything else is just amazing!