I love the theme and how insignificantly tiny I feel!
I've recently been playing Baba is You so this game felt right at home for me with thought-provoking box puzzles, haha!
As a couple others have mentioned, the only real changes I'd want to see made is the ability to move faster over long distances and an undo button would be a pleasant perk to have, although I think faster movement would offset it if it couldn't be implemented, because it'd be easier to get back to where you are.
Maybe a possible solution could be to allow continuous movement unless you're in the vicinity of an enemy or pushable object, where the movement becomes more controlled like it is now?