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 $36.9K — a different platform, not this one.

Fear Equation

Fear Equation is a genre-spanning horror strategy game where no two games are the same. The world is covered in a mysterious fog. Most who enter the fog disappear, and those who survive say it brings their nightmares to life. You are The Engineer and you're in control of a very special train. Will you rescue survivors and keep them safe from their nightmares? Can you lead them to salvation? Complex strategies: Manage up to 150 passengers, build defenses, upgrade the train, and optimise the engine's power, fuel and speed. Darkest fears: Monitor your passengers' dream logs to discover what kind of horrors will attack the train. Into the fog: Send passengers out into the fog to investigate locations, find survivors and bring back supplies. Carriage politics: Passengers form factions and alliances, and, if you're not careful, they'll revolt against you. Immersive environment: Interact with a set of intricate machines and devices within a richly detailed 3D cabin.