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 $682.2K — a different platform, not this one.

Runestone Keeper

Runestone Keeper is a challenging roguelike to roguelite dungeon crawler that blends classic role playing elements and turn-based combat strategy. Dive into the dungeon roguelite-ness and begin your very own epic adventure! Grab your rucksack, sharpen those dusty swords, step into the dark chamber and fight for glory! Randomly Generated Dungeon Elements – Almost everything is generated differently each time to ensure a unique experience! Prefix and Suffix Based Equipment – Loots come with random yet rare prefixes and suffixes. Combat, collect and combine for a killer suit! Diverse Monster Mixes - Tread lightly, or be ganged upon by monsters with complementary abilities that might drive you crazy. Items, Traps, Devices and Events - Opportunities for a favorable turn even at the most desperate moment. Choose wisely and use the unwelcoming surroundings to your advantage! Heroes and Goddesses – Create your hero’s attributes build! Sacrifice to receive your mighty God’s blessing (and later betray him to check out his fury)! A Challenging Experience - Prepare to have a tragic (not to mention permanent) death.