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 $7.9K — a different platform, not this one.

Hexplore

Immerse yourself in a medieval world. A world where Garkham, Grand Master of the Black Magicians, has sworn to take possession of the Book of Hexplore. From this moment, the whole world is in great peril. For this manuscript will most certainly lead those who find it to the Garden of Eden, resting place of the Divine Power. Aware of this immense danger, four heroes join together to thwart Garkham's evil plans and so a perilous adventure begins... Experience the adventure from whichever perspective you wish, thanks to revolutionary technology which offers you 360° camera views without an accelerator card. Recruit and control a team of four characters: a warrior, an adventurer, a magician and an archer, each with his own individual characteristics. RevelRevel in incomparable gameplay, thanks to an explosive mixture of action and adventure throughout more than 200 maps.