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 $54.5K — a different platform, not this one.

Geneforge 1 - Mutagen

Geneforge 1 – Mutagen is a unique, truly open-ended fantasy adventure in a strange, new world. You are one of the Shapers, wizards with the awesome power to create life. Want a tool, a trap, an army? You summon it into existence. You create mighty beasts, and they totally obey you. Usually. But now? Your creations want to rebel. Will you crush them? Or help them? Geneforge 1 – Mutagen offers unmatched freedom in how you play. Use magic or your deadly pets to crush your enemies. Or, use trickery, diplomacy, and stealth to win the game without ever attacking a foe. Choose between a host of rival factions or just destroy everything. Defeat the final boss, or switch sides and join him. Fight alone with blades, missiles, or magic, or create your own army of custom-made mutant monsters. Geneforge is an epic fantasy adventure with over eighty zones to explore and 50+ hours of gameplay. Choose from dozens of skills, abilities, and pets to reach a vast array of different endings. The coming rebellion will scorch your continent. Who will win? It will be up to you.