No revenue estimate for GOG — its rating/review counts don't calibrate to sales the way Steam's do. The Steam version is estimated at $23K — a different platform, not this one.

Dark Fall: The Journal

You come back from work hoping to get a good night's sleep but then you notice light blinking on your answering machine. It was your brother – an architect redeveloping an old train station and hotel. He called to ask for your help. Alarmed by his frightened voice, cryptic information about some disappearance and strange whispers in the background you board a train without hesitation. From now on your adventure has just begun and soon you will realize that although no one is there, you are not alone... This Myst-style horror-adventure game will bring fear into your heart. From the very beginning you are exposed to an overwhelming but invisible ghost presence – strange calls, footsteps, voices from nowhere. In order to help your brother and survive you will need to solve the mystery of this abandoned, haunted place. And remember! Do not let it to find you! Do not let it to find you... Do not.. Let... find... The game is best played in a dark room with your speakers turned up. Unless you're scared, of course. A gripping and highly immersive storyline The eerie atmosphere of real ghost hunting Sceneries and ambient noises that will chill your very bones