Limbo is just shy away from being a superb game. It starts off brilliantly, with great atmosphere, simple puzzles and platforming. Later on it, as if there had to be some kind of a trade off, it loses the atmosphere and (little as it was) storytelling to gain complexity in the gameplay department. I'm not too fond of the ''trade off'', since Limbo as a platformer needs some serious tweaking, although saying that it's a great puzzle game.
Pros: Great puzzles, awesome secret level, unique art style
Cons: Troublesome controlling can lead to some needlessly aggravating sequences, barely any traces of a story(telling), the art style can be tiring on the eyes, if only there was more exploration