As a puzzle designer, Isee many games with engrossing mechanics that are good for an hour, or a half hour and putter out. This game, for every individual puzzle, I am left entirely flabergasted at how it fully realizes its mechanics and how it interplays with every single core function of the game. It might come across as stifling or difficult if you are trying to push through it, but if you listen to it's design, you will learn something.