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 $138.9K — a different platform, not this one.

Oaken

Oaken DEMO is available here The world of Oaken is a mythical place, existing in a not easily defined space and time. It is stretched among the branches of the Great Oak. Its inhabitants are spirits that listen to the same voice, called the Oak Song. The loss of that voice starts a series of events leading to a struggle that may either heal or destroy the Great Oak. Roguelike, hero-oriented campaign with deck management. A mystical world inhabited by spirits with celtic and tribal vibes. A randomly generated world map with tons of levels, bosses and events to be discovered. Unique, highly tactical battles on a hexagonal grid, where position and rotation is everything. Upgrade your spells and spirits the way you want. Easy to learn, hard to master - chill and challenge modes suitable for any player.