Alien Isolation.
Pretty much a perfect game to me as I love the Alien movies (1,2 and 3 only)
The way the game captures the scifi horror of the movies is simply genius.
I didn't care that I died so many times and had to replay from the last save, this made me play the game slightly different each time making the game so tense and the encounters with the Alien different, sometimes harder, sometimes easier.
It's one of the few games that I became engrossed in and literally felt the feeling of terror and suspense when playing.