I like this. I actually made a trio of baba is you levels with a similar idea.
here are the level codes if you're interested (and have the game):
first: 9FEK-7GGV
second: BPJA-XUPZ
third: N8RY-JTB2
The first one is a good tutorial for the basics, the second one I'm not proud of, but lets you experiment with and understand some other key details, and the third one is the most difficult (remember to take into account what it says in the bottom middle for that one).