Really cute game! took me a good minute to figure out what was going on but after that the puzzles were really fun to figure out. Nice job!
On a side note, the getting off grid bug others have mentioned scared me a bit the first time it happened since the music just turned into static for some reason. I thought the game is about to turn into some analog horror type thing lol
Edit: One thing that I think would add a lot is an undo mechanic. I had to reset the entire level quite a few times because i did one wrong move by accident. Didn't really matter that much since the puzzles were quite simple, but it would improve user experience a bit, especially if you plan on adding more complex levels