I just finished Signalis and one of the things I enjoyed most about it was its atmosphere! The music goes a long towards realizing that atmosphere.
It feels very much inspired from Silent Hill (SH1, especially), a mix of ambient synths and harsh, distorted percussion.
It's not all my favorite stuff (A lot of the enemy encounter stuff can feel samey) but it is enjoyable all the same!
Favorite(s): Safe Room, Train Ride, Ritual, MYNAH, Eulenleider, Die Toteninsel, 3000 Cycles, Home, The Promise