Horror games as good as Amnesia?

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Thief: The Dark Project is still among the scariest games ever made (and it isn't even explicitly a horror game!) and is also the best stealth game ever and has some of the best writing, level design and sound design ever in a game. The controls take some time getting used to (not sure how the Thief Gold controls are; maybe they are more like Thief II's- however take note that the new levels added in Thief Gold are controversial with fans. Some of them are not as well designed as the original levels and feel like padding in an already very long game) but once you do you will realize how perfect they are.

Vampire: The Masquerade - Bloodlines is also really disturbing. It isn't scary like Amnesia is with you trying desperately to survive (granted some of the fights are brutally difficult); it just has a lot of really unsettling themes and disturbing imagery that really builds quite a scary atmosphere. It's pretty buggy unfortunately but so worth the playthrough.