Okay, first things first. For just 12 hours this is very good. Why you only have 12 hours in a one-week jam is beyond me, but I guess life always gets in the way, and there is way more important stuff than a game jam. I think this is quite a nice Sokoban puzzle game, and I really like that out-of-bounds mechanic. It's just a shame the game is this short, but I really feel the potential as a nice indie puzzle game. I like that simplistic art style a lot. It has a certain charm to it. The puzzles are quite nicely designed too, it's just that it's a bit on the easy side for me right now (Probably it's just me playing too many puzzle games).
My only big criticism for this game would be the input controls. My guess would be the way you treat holding buttons, but currently, it's way too easy to mis-input and add in an unwanted movement, screwing the puzzle up and need a restart. There's another minor criticism where I can't understand what the green "lock" and "key" really is judging from the pixel art along, but thats just a no-brainer to fix.
Anyway, this is a really nice game! With a bit more polish, this will probably be much better, but it's already a great game now. Good job!