Don't be fooled by its simple look: this is a very difficult puzzle game, though very well-crafted and with very satisfying solutions. What I like about it best is its meta aspect: sometimes, solving a level isn't too difficult, it's finding the solution to get you to the correct next level that is.

It's a little too difficult to navigate for a player like me, and some of its mechanics I didn't quite grasp. But it's one I'll come back too every once in a while, I think, especially since most levels only take a handful of minutes to fiddle with!