The main mechanic is implemented very well. I would have liked to see some utilization of its interactions with ceilings. Maybe if it was on a toggle instead of held and you had to set yourself to the right height for stuff?
Anyways, this game feels very solid and rewarding. Each point of progress was slightly surprising without making me feel dumb for running into them, which is a hard balance to get right. The controls are a little jittery but it never demanded so much from me that this became a problem.