Thoroughly enjoying SOMA. 10 hours so far.
http://somagame.com/index.html
https://en.wikipedia.org/wiki/Soma_%28video_game%29
It is creepy and atmospheric. It is not bleeding edge graphics but the design makes up for that. It has asked what it is to be human. That is, what defines a person. The problem solving has slowed me down a couple of times. It is quite slow paced without being tedious. Given it is set underwater I often have flashbacks to Bioshock.