Really great idea! The puzzles are great! I got stuck on the 3rd or 4th room, whichever had the introduction of the walls you could go through. Probably just because I'm not great at slide puzzles lol. But I love the art in this! The only critical feedback I would give you is that it's hard to know how far things extend. Often I would go toward an object expecting to bump into it, to only pass behind it. So perhaps using half pixels to make that clearer. Other than that, great job!