Genuine horror is a bold objective for a handheld game. It's very hard to create an atmosphere when your material is contained entirely in two tiny screens (and proportionately tiny speakers.) In fact, we'd say that it's even harder to make a handheld horror game than it is to make a good FPS on the DS. Renegade Kid seems to be pulling off both tasks with Dementium, however.
This fun, spooky feature from Gamepro outlines some of the scary junk that will jump out at you during the game. It's all screaming this and blood-covered that. We suppose that if you're avoiding spoilers, you may want to skip it, but we think that even if you know something is coming, there's still a good chance it'll give you the jibblies when it does bust through the window.