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 $2.6M — a different platform, not this one.

Graveyard Keeper 2

You are the Grand Inquisitor now! Restore the Town and lead your undead army into battle to save the realm from a zombie apocalypse. Welcome to Graveyard Keeper 2 - the sequel to the original, unhinged classic! Manage your own medieval graveyard Automate your production like never before Lead your zombie army into battle and fortify the Town against the undead Rebuild The Town and milk its residents for maximum profits A world full of unhinged humour, grotesque characters and a twisted story Build and manage your own medieval graveyard. Harvest as much flora, fauna, and human remains as you can to build extraordinary machinery, automate production, and expand your graveyard for pure profit. Become the Inquisitor and lead your undead army into battle to save the Kingdom from a zombie apocalypse. Build towers and fortifications, craft powerful armour and weapons, arm and train your not-so-smart troops, and slash your way to victory! Help the townsfolk restore their homes and turn their problems into revenue. Complete quests throughout the city, as your undead workers take care of the heavy lifting behind the scenes. With zombie-based automation and structured systems, you can transform local efforts into a scalable and profitable operation.