Well thanks everyone. I have a better understanding now, and it sounds like a great concept.
I think this game can really benefit by being made for the Wii. I don't remember who (speak up!), but someone mentioned an alien game a few years back where you rolled around with a flame-thrower and your only "radar" was this 'blip' that came from your Wiimote. The faster the 'blip' the closer you were to your enemy. Now that was a damn good idea.
It would be cool if this game used that same idea, where your entire HUD was completely blank and your radar was audible. Also, you could show your health by making the character hobble, have blood dribble down the screen, by having the character breath harder, or many even through insanity effects.
I haven't played the other games, but I don't have to to know this game has a lot of potential.