I loved this game. It jumps straight in, explains a simple concept, then presents it in a complex way. It layers on such simple concepts kind of like "Papers, Please", and you actually learn how to play as you reach the end of the game. It's concepts are beautifully simple, and it's level design is extremely straightforward. It's lean look and feel helps me focus on the puzzles more - I appreciate that a lot, too.
I wasn't a 100% sure how the "built to scale" aspect was integrated until I reached the 4th dimension - that was also very well done.
I can't suggest anything to improve on, because I'm not sure if there is anything.
This is great! Kudos, I really wish to be this good at puzzle design someday.