A first-person... walk around adventure? The 'game' itself is incredibly straight forward, but the real fun comes in going against the 'intended path'. This is a game with real self-awareness, and parodies itself and the entire gaming medium. I laughed out loud several times at the ways it plays with the form.
Don't expect to be challenged in any significant way, other than of your own expectations. Having said that, some of the achievements and ending requirements are absolutely fiendish. 'Play for all of a Tuesday'. And there's worse than that
The narrator for this game is fantastic, and clearly enjoyed what he was doing. Or faked it incredibly well.
Basically, if you're after a traditional game, steer well clear, but if you're after something lighthearted (and yet thought provoking) that is an exploration of the form, definitely give it a go.