I remember playing the original doom and it scaring the **** out of me, not because of the creatures, although some were definitely pretty scary, but because of the inevitability. I still haven't beaten that game because of one part where you don't have enough ammo and you're surrounded by those flying one-eyed monsters and those devil looking creatures. You can run around the level and avoid them, but it's a small donut shaped building surrounded by lava. So eventually you have to attack, but you simply can't kill them all and they always kill you. Scared the **** out of me.
This game seems nothing like that apart from the molten lava.