Pretty nice platformer. Does an obvious mechanic in a really fun way. I think the camera could use some work, though, there's a lot of points where the player moves up/down very fast and goes offscreen, which doesn't feel great. The slopes not working due to needing to be stairs for the size mechanic didn't really feel great either.
Still, it's a very solid game overall with some clever puzzles. I especially liked the part with the frozen waterfall, that was clever.