I liked both the Penumbra series, Amnesia, Outlast and Alien Isolation, but I'm a bit torn regarding the "get seen and it's game over" gameplay in these games. Getting a flamethrower in Alien opened up the game a bit for me.
I actually played Alien for the first time this year, on the hardest default mode, then the DLC on Easy, because I was burnt out on the gameplay.