Limbo is not a place is state of mind!
Pay attention to all the details they are important or you will die a lot, a lot... the limbo isn't the end the it is your only chance to save the girl.
Puzzles and jumps, some hard others just different than you may think, it is an amazing way to see platform games with a very disturbing setting. The music really makes you go places and lose yourself into the game, with no voice of the boy you really feel him dying in some suffering ways or just by falling to the precipice.