Really sweet artstyle and neat intro. The game window being oddly shaped lends to its charms. Puzzle design is tight although I was confused for a moment on how the block movement works exactly, guess it could be better communicated e.g. with a block slide of some sort? Glad there's a nice ending at the end of the experience as well (although I sadly got stuck!)
Was somehow expecting to interact with Unity UI somehow, but I guess it'll be hard to replicate Unity inside Unity.. (now that would be super meta!)