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 $6.8K — a different platform, not this one.

Mythargia

You are a journalist in search of your breakthrough story. A promising lead takes you to the abandoned island of Mythargia where you have to discover its buried history connecting two different dimensions.  Mythargia is a 2D side scrolling retro adventure with emphasis on discovering the island’s story. Explore the island:   As you search for information you will come face to face with the unnatural present on the island. Find tools and items to help you on your journey further inland.  Unravel the secrets:   Leave no stone unturned as you travel deeper into the island. Solve puzzles to find all the clues you can find to get a full picture of what has happened on the island.  Discover the nightmare:   Enter the other dimension and assist the islanders to earn their trust in order to learn more about them and their backgrounds.  Gather information:   Write journal entries and take photos of your journey to understand what has gone down on the island of Mythargia and compile a story of the century.