Can you define what makes Amnesia scary?

[Wooderson]

I like how with this game, if played seriously, you can be scared almost constantly. I can bet some people will play Amnesia rushing it for the sake of it and say "All of you are pussies" or some other insult to fans.

Unlike most horror games, Amnesia lets you know that something is there and lets your imagination do the rest. The atmosphere is terrorfying and at times will make you panic on a simple decision which may lead to worse concequences.

To sum it up, I dread playing FG Games which is probably why they're so great.