Speaking of GOG, I just finished a game called "Dreamfall: The Longest Journey". I gushed about it to others immediately after the credits rolled in. It's a sequel to a game called 'The Longest Journey' (a point and click game from 1999), and both those games have some of the best writing I've ever seen in a video game.
Honestly, Dreamfall was way ahead of its time in terms of storytelling in a video game. The controls in the sequel are a bit wonky, but if you're interested in it, I'd seriously recommend the pair of them. I always tell people to play/watch/read things in release order, and if you play The Longest Journey first, it will make you appreciate Dreamfall a million times more.
There's also a third and final installment called 'Dreamfall Chapters' which is available on both console and PC, but I've not played it yet. I've heard it's a great conclusion. Either way, those first two games are worth playing for the writing alone. It's a criminally underrated series.
Be prepared to have a guide handy though, they were the first games that ever made me need one.