A made this topic over a year ago, and since then I've completed a number of the games on PC discussed (or not discussed) in this topic: Life is Strange, Spec Ops: The Line, Undertale, Game of Thrones - A Telltale Games Series, and Bioshock Infinite. I actually tried Bioshock 2 but got bored so I skipped over it to get to the third game, which is easily the best in the series, although like all Bioshock games it drags in places. As you can probably tell, the games that hold me until the end tend to offer thought provoking material relating to human choices.
Also, I've been getting into walking simulators and played through Dear Esther, Abzu, Virginia, and Firewatch. I have started others such as Lifeless Planet (nice recommendation @legaiaflame) and intend to finish it. I like the shorter nature of these games; they often feel like a tour through terrain not normally covered by video games. But I can understand why they're not for everyone.
I had trouble getting The Longest Journey to work on my retina screen, but given the positive views of it from people here I'd still like to play through it. I see that there's an iOS version which might be an option. Along with The Longest Journey, I still haven't played The Walking Dead and Fahrenheit which might be worthwhile pure story driven games to play next.
I've also tried lots of other games mentioned here but have not completed them for various reasons. I mentioned earlier that I played through the Tomb Raider reboot and I see that the sequel is out now on PC (although it will probably struggle to run on my hardware). I'm less concerned with keeping up with AAA titles though and IMO while Tomb Raider is a solid game, the series has become so hemogonisied that you're not really missing out on anything if you've already played similar games. I've been thinking about this more recently, and why we constantly chase after the next big game which is just a more advanced version of last year's big game... it's all a bit silly really, because as soon as you play the newer version, the older version is harder to appreciate. So I think in the foreseeable future I'm going to focus on playing games that have a timeless quality to them, which aren't as replaceable, from the sixth and seventh generations. The PC has an awesome library for this if only because it's so huge.