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!

Interesting puzzles and very original idea of the theme! Loved it!