After signing up to GOG to buy Superliminal, they offered me a new user discount on a chunk of games. As part of my inburgering I am obliged to buy anything marked with a 35% KORTING or better. Firewatch was "-75%" so a 40% better deal than that oven-ready satay badger with a use-by date of today.
Superliminal, the first and so far only game by Pillow Castle Games, is a first-person 3D puzzler which is often compared with the Portal series. Portal and Portal 2 were corkers, and the lack of another sequel left a void.