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 $244K — a different platform, not this one.

Sanitarium

Imagine a world created out of insanity – deformed children, ancient gods, ghosts from your past in the house inside of a water reflection. You are an asylum patient and you have just survived a car crash – the problem is you can't remember anything. Visions reveal answers to some questions, but create even more riddles! Which part of it is true? What do all these things mean? Sanitarium is one of the few psychological horror adventure games. As the protagonist you will visit five different worlds full of riddles and answers, with which you will have to figure out what exactly is happening and what is real. The story is so incredibly good and enthralling that it could easily drive a sane person mad. One of the most immersive and chilling psychological horror games ever created Discover what your warped mind is hiding under the veil of a psychedelic dream Explore surreal worlds inhabited by crazy, half-sane and or half-dead characters