The most interesting thing about Lone Survivor's survival element is that it really makes you question how bad you want your character to survive. Should you eat that disgusting squid? Is that gross meat you found even edible? What about those pills? What could they possibly do to you if you take them? Lone Survivor makes you explore the deepest depths of your survival instinct, and when you realize how far you have to push your character, it can be truly terrifying.
That's not the only thing that's scary, though. No, Lone Survivor makes it a point to scare the crap out of you throughout its entirety. But it doesn't do it with jump scares. It does it with atmosphere, sound, and imagery. You know when some imposing mutant is nearby, and if you have a flashlight on you, you may want to think twice about turning it on, because if you do, you'll draw attention and have to run for your life.
Getting away from one mutant is OK, but when you see that there are three of the damn things following you — chasing behind you and even crawling eerily on the ceiling — you know your best bet is to find the nearest exit. Sometimes, that exit isn't very close, so if you find a hiding place, you'll have to use it to your advantage and hope that the mutants get away from you. You can actually lead these enemies to rotten pieces of meat, and when they're distracted, that's your cue to get away.
You also have a gun, but ammo is scarce, and you can't go in with guns a-blazin'. Do so and you may find yourself drawing unnecessary attention. That gun's no use to you when you've got a group of mutants clawing away at you. If you want to succeed in the world of Lone Survivor, know that your gun is an important tool, but it should by no means be your go-to item whenever you feel threatened. Oftentimes it's best to run or hide in the shadows.