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 $184.8K — a different platform, not this one.

The Book Of Unwritten Tales: The Critter Chronicles

The stand-alone expansion to The Book of Unwritten Tales! Warning: This is not a sequel, it is a prequel, and it is a stand-alone expansion, in case we forgot to mention that salient little detail. The Critter Chronicles tell the story of how adventurer Nate Bonnett and Critter, his hairy sidekick, first met, all set before their appearance in Wilbur's and Ivo's epic adventure in The Book of Unwritten Tales. Enjoy a thrilling and hilarious point-and-click adventure in the fantasy world of Aventasia. Travel from the Northlands to the Mage's Tower of Seastone and experience a tale that offers tremendous fun for seasoned players of The Book of Unwritten Tales and newcomers alike. Play as both Nate and Critter. You and you alone decide with whom you want to spend more time. Meet crazy new characters such as animal rights activist, Petra, schizophrenic Yeti, and the "Critters". Choose between two levels of difficulty: Normal for beginners and Hard for true veteran adventurers.