LadyMarth01, Album of the Day 245: The Old City - OST by Atrium Carceri
https://cryochamber.bandcamp.com/album/the-old-city-ost
2015 dark ambient OST from Stockholm, Sweden. The game itself may be a "walking simulator" that's too philosophical for its own good, but the soundtrack is wonderfully moody and atmospheric.
My picks: "Leviathan," "Childhood I," "Dark End"