The puzzle solving is neat, but the levels are so unnecessarily large that it detracted from the game for me. I feel like the game might've been a lot more enjoyable if all of the levels were no more than a screen or two wide and tall - I think that'd make it less frustrating when you need to restart a level because you trapped a weighted companion cube in a corner or pushed it off into the abyss. Also, like a lot of the platformer submissions I've tried, I think the way jumping feels would benefit a lot if a little bit of coyote timing (ledge tolerance) were implemented.