Setting the tone of the game

In light of my desire to try this: You’re all going to die.

I’ve decided that for the March trip, I’ll be bringing each player a small flashlight. When we play “those meddling kids” I’ll turn off the lights and require that everyone play by flashlight. If your character dies, you must turn off your light.

Has anyone done anything like this? Does anyone have any advice? It’s kind of Survivor-esque, which (thought a cheesy show) is the “pick ‘em off one by one” feel I want to capture. I’m hoping to tone the game very Call of Cthulhu-esque without making the spiral to madness and oblivion so pervasive.