Although it's easy to make comparisons with this and Portal (First Person Puzzle, White Tile Aesthetic, Short in Length), this game certainly stands up on it's own merits. There's a lot of interesting puzzles to be found here, that start off with simple concepts and build to create amazing obstacles (just like a good puzzle game should). The difficulty for the majority of the game is fantastic, easy enough to avoid frustration, but hard enough to reward the player with satisfaction. There is however an odd difficulty spike in Chapter 6, which contains some puzzles that should have been included as optional content. The game does have fantastic variety in gameplay, and if you can ignore a few irritating glitches, it's very enjoyable.