Tom Byrne composed the hostage music and care home music you hear in the demo. The rest of the music from the trailer and demo are from these users on freesound.org:
Trailer music:
Dramatic sample by tyops
Game music and sounds:
Reverb Kick by djkanis
DOOR Apartment Wood INT open close medium near MG by matucha
Door Open by timgormly
carEngineStart.wav by davidbain
footsteps rug by Yuval
Reverse piano by JarAxe
telephone ring.wav by xyzr_kx
footsteps on wood by Mydo1
gunthing.mp3 by steveygos93
Gunshot 4.wav by ShawnyBoy
DramaticStabs.wav by Sclolex
front door open.wav by THE_bizniss
Doorbell 1.wav by bennstir
Car Passing by Johnnyfarmer
Radio Static by stondi