timppu: So what kind of game is it? A puzzle game?
OldFatGuy: Yeah, quite a lot like all of the other Zachtronic games.
Not sure if I am familiar with them, but yeah, I guess not my cup of tea. SpaceChem sounds familiar, I may have it from e.g. Humble Bundle and tried out the Android version on a tablet. EDIT: Ummm, ok, I seem to have SpaceChem also on GOG. :D Yeah I'm pretty sure I've tried that game on Android.
Such pure puzzle games, including even classics like The Incredible Machine, Lemmings and even The Lost Vikings feel too much like "work" to me. I guess I just want my games to be more... game-y. Entertaining me as well, not merely testing my logical puzzle solving skills.
EDIT: Portal is an example of a puzzle game I enjoyed a lot. It did a good job at entertaining me at the same time as I was trying to figure out how to get out of a room or show GladOS who is the boss around here.
Anyway, if GOG rejected it and I'd want the game, I guess Humble Store would be a good alternative. As long as they keep it up to date there too, not abandoning it and updating only on Steam.