Invisible, Inc OST - Sankaku Corporation (Alarm 0-6)
Akuma Drones are scary.
Alarm 0 - 0:00
Alarm 1 - 2:33
Alarm 2-3 - 5:07
Alarm 4-5 - 7:40
Alarm 6 - 10:14 | Siren - 12:48
Still waiting on Klei to release their official soundtrack.
EDIT: Official soundtrack available below: