The Edge of Time

You are chief of security at a remote research facility on terraformed Venus, overseeing a project to develop alternate teleportation technology capable of moving through time and alternate universes. The science is progressing. Then, during a routine hike, you hear the base alarms and a garbled radio message: a demonic invasion has begun. You have your service pistol and the distance back to the facility. The demons cannot be allowed to reach the technology. A first-person shooter built on that moment of sprinting back toward a crisis.