well for one it would be different and better because for once you have to survive and hide instead of going around shooting aliens,facehuuggers,etc. That's really cool though the only aliens game I can recall close to this is the one level in colonial marines "the Raven" where you have to avoid those boiler aliens. This would probably attract more people to it as long as it doesn't pull one of those it looks like a awesome game and turns out to be crap. But the screenshots and trailer make it look good.