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 $44.6K — a different platform, not this one.

Overfall

Explore the shifting seas of a strange realm. Fight challenging foes…or befriend them. Recruit lost souls and learn their histories. Take part in stories of the absurd and the tragic, the magical and the mundane - intimate, epic, and never the same twice in this fantastic strategy roleplaying game! A huge, dynamic world to explore, ruled by a number of races in constant conflict - it’s up to you to help or betray them. Challenging and addictive turn-based combat - careful strategy and cunning skill combinations are the key to victory against your foes! Interactive story encounters where the choices you make and the allies you recruit ensure no two journeys are quite the same. Permanent hero death, procedural world generation, and high replay inspired by classic roguelikes.