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 $5.7K — a different platform, not this one.

Blake Stone: Aliens of Gold

Here's the hot action hit that'll rocket you into the future!     Grab that grenade launcher and get aboard! The sinister Dr. Pyrus Goldfire, using genetics to create an army of bizarre creatures, is waging war on earth. What's more, he's discovered how to make pure gold to fund his maniacal plan. Only you can help British military agent Blake Stone penetrate the top-secret locations where Goldfire's mutant creatures are being hatched. Stop the madman and his mutants before they crush the cosmos!   Swift and shimmering 3D graphics, brilliant music, astounding digital sound effects, riveting first-person perspective – it's all waiting for you in Blake Stone: Aliens of Gold! Face enemies with real artificial intelligence whom you'll have to outwit as well as outgun! Features   66 amazing levels (with secret levels for expert players)! Original musical score & stereo digital sound effects! Automapping to help you find your way! Fantastic futuristic weapons! Roving mines that explode when shot! Direct Level Transport-move freely among levels! Spectacular cinematics in each episode! ... and much, much MORE!