The author says it's still just a prototype, but what's already there is good enough for me :). In this episode of "2D platform games with a twist" we get to swap around item's sizes. So, you got a big crate you can't jump over? Click it, then click another smaller item (like a picture frame) and presto! they exchange sizes! With later puzzles even your character changes size, so I'd say it's definitely something to try out and keep an eye for in the future!