By removing the Shooter element from the FPS, 'Penumbra' created an eerie FIRST PERSON SURVIVAL PUZZLE genre that surprisingly features some unexpected, nicely paced, action sequences without any direct combat from time to time. You can actually melee some foes or trap them but you'll most likely just sneak past them in the dark (unless you're being swarmed by spiders). The interface is mostly a point and click plus, where not only you get to combine elements to make your way through doors and passageways in endless halls and corridors, you also get to interact with the environment in 3D (with the occasional frustration of not turning a wheel quite right to open a hatch or not thrusting a rock hard enough to break something). It's indie games like this that paved the way for something like 'Alien Isolation' and it's still today one of the coolest games out there with a great storyline and level design. In some ways I prefer this to 'Amnesia', specially because here the dark is your friend and doesn't drive you mad like in the later game (A mechanic that was introduced in order to force you to use lights as if it was food, to recharge your sanity).