Can you define what makes Amnesia scary?

[TheDarkDescent]

The atmosphere makes this game the scariest. The sounds too of course. Also, the low amount of monsters makes this game scary. When you first begin playing, you can see some monsters. But they don't harm you. Like when you go into that hall where the stones falled down behind you, when you had to pull those books to get the wine cellar key. When you went back and look at the stones, there's a grunt running towards you and then he disappears. This made me think, there's a monster behind every corner. Atleast that thought so. As I said, atmosphere makes this game the scariest. The darkness, the textures of the walls, the creepy sounds, and the thought of a monster is behind you, and behind every corner.