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 $57K — a different platform, not this one.

Dragon Ruins II

Aeons ago, dragons used to rule the world, but it only took one man to steal the fire from a dragon to start a chain of events that eventually led to their disappearance. What remained was a myth that passed from generation to generation that they amassed mountains of gold, and the other part where the dragons return to rule again has been all but forgotten. Today, a band of adventurers has gathered together to become strong enough and find the mysterious treasures left behind by ancient dragons. Alas, the road to glory and riches starts at the very bottom...   KEY FEATURES Assemble a party of 4 adventurers Take on quests, seek treasure, and grow stronger through automatic battles Find new equipment and unlock new skills to get an edge over your enemies Revisit completed quests to see new stories unfold within the familiar areas