Martin Stig Andersen. Same guy that made the Limbo soundtrack, except his ambience here seems more polished for a modern era game. Stranger soundscapes than Limbo, which fits the mood. Petri’s stuff is pretty good, too, but it’s a different kind of creepy ambience and he’s not afraid to put more energy behind it for the fight scenes.

I have this in my Halloween playlist to weird out the trick-or-treaters.