Tuukka Junnikkala Analogue: A Hate Story is one of my favorite games from the ones I played in 2012. The soundtrack is something truly unique as well. I have in fact never encountered anything like it. When I listen to the music it has an incredibly deep impact on me that reaches even deeper than my emotional level, which I have no idea what to even call.
I can't guarantee that the music will have a similar effect on other people, but based on my personal experiences I highly recommend both the game and its OST.
Favorite track: Mute (Feelings).