"Horror is a genre that shines on the format of video games. Nothing will immerse you in the awful goings-on of a story more than being in control of whether your character lives or dies. It works so well that you can find horror elements in many of the major franchises. Games like Halo, Bioshock, Left 4 Dead and Half-Life are a major force in the video game world and I'd argue that that's due, in part, to how well the designer evokes the feeling of fear. Fear is just easier to create within the interactive nature of games; it's fun, it's safe, and the fear is personal."
It's worth a look.