There really isn't anything that you can say about this except that it isn't a game. Anyone buying it as such will be sorely disappointed. What it IS is a brilliant commentary on not just gaming culture, but the thought processes of gamers themselves.
It really is brilliantly done, and superbly executed. As a gamer, I felt a strange air of danger and menace throughout, as if something was going kick off and lead to some sort of battle for survival, and the game plays with this notion throughout, offering a number of different "endings". The "good" ending (which I won't spoil) is a very well observed satire on game design and player choice.
It really is hard to write anything about the game without spoiling something! All I can really say is - it's not for everyone. Some people may look down on people who don't enjoy it or don't get it and that's not entirely fair. The ideas and concept explored aren't hugely complex, but probably require a high level of self awareness and self criticism on the part of the player.
In summary - this is a sublime mix of art, gaming and genuine entertainment.