These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Anti Chamber
Award Snub: Despite all the press and praise early in 2013, by the time the end of the year rolled around this game had been largely forgotten by critics on "Best Games of the Year" lists.
Captain Obvious Aesop: The quotes you find scattered throughout are intended to be both clues and musings on the nature of life (see the game's original title). Many find them more useful as the former than the latter.
Game Breaker: The Red Gun's ability to turn as little as two cubes into a theoretically infinite number of cubes trivializes all of the puzzles that weren't specifically made with it in mind. Depending on how well you know the layout, this can be a lot of puzzles.
Nightmare Fuel: The ending may qualify. As soon as you capture the black block, the game loses all color and the ambient soundtrack becomes dark and ominous, with the constant rumble of thunder being heard in the background. And if that wasn't enough, once you shoot the black block into a wreckage inside a dome, it rises up and forms the Antichamber logo, which starts sucking everything in like a black hole, including you. After that, the credits roll... and then the game closes itself.
The DON'T LOOK DOWN room. Take the Schmuck Bait, and you see a giant eye appears on the floor. It blinks, the floor disappears, and the player is forced to plummet down a lengthy shaft while the usual ambient sound changes to a thunderstorm.