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 $773.8K — a different platform, not this one.

Oceanhorn: Monster of Uncharted Seas

You wake up and find a letter from your father. He is gone… The only lead is his old notebook and a mysterious necklace. What happened? Oceanhorn: Monster of Uncharted Seas combines captivating storytelling, breathtaking 3D visuals and exciting gameplay into one epic action-adventure experience. In the game you explore the islands of Uncharted Seas, a world filled with many dangers, puzzles and secrets. You must fight monsters, learn to use magic and discover ancient treasures, which will help you on your quest. Use all of your wits and skill to unravel the mysteries of the ancient kingdom of Arcadia and the sea monster, Oceanhorn. 15+ hours of story driven gameplay Great controls for both Controller and Mouse and Keyboard Classic gameplay in stunning 3D