Once a decade a game comes out that provides an experience far beyond the norm.
I heavily loved this game, once I got past the initial "it's not like Limbo!". Limbo was almost more like a teaser for THIS game, and that is quite a feat. The scenery is outstandingly atmospheric and the 'plot' elements disturbing, spooky, and creepy. The control mechanics are intuitive and flawless, just like Limbo. I have not been so drawn into a game in a long time (um..since Limbo actually).
Story/plot-wise, the game is like a box of cardboard puzzle pieces, each of which teases at a wonderful mystery but you can't quite get all the pieces to fit together. You get some ideas but none that are easy to apply.
The creators managed to create a load of bizarrely mysterious aspects that hint at a rich and colossal story-line without ever fully connecting the dots. Sometimes a mystery needs to remain a mystery or it loses it's magic, and this is a magical game. Why are there CHILDREN?! It's choices like that that derail any familiar explanation.
Like a powerful dream, this was a mysterious experience, not a story. That detonation level was so intimidating and oddly familiar, and yet seriously hard to rationalize with any conviction (I degreed in physics so it is not surprising I am little haunted by a level so dominated by power that I can't explain.)
The creators truly created a successor that honors Limbo without attempting to recreate it. It's hard to imagine what the next game will be like, but then I said a Limbo sequel was bound to fail.
Don't play this game while on the phone with a friend and the TV blaring away; sneak into your PC (or console) after dark while everybody else is sleeping. Use headphones.