It takes place mostly on an outpost on the Moon. After a mysterious burst of energy coming from fifty miles away, your character, an astronaut, is assigned to investigate. All of a sudden, most power is turned off to the facility. It turns out there is a relic on the moon belonging to aliens.
No HUD to add to the experience.
Enemies are either humans driven insane, mutated humans or aliens.
What do you think?
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How about this: The main antagonist is a little girl with dark hair and wearing a pure white dress. It's been done to death but it still scares the -blam!- out of me.