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 $71K — a different platform, not this one.

Vertical Kingdom

Vertical Kingdom is set in a world devastated by a war that lasted for an entire generation. The once great Empire is in shambles and it's up to the Great Architect to rebuild toward its former glory brick by brick. Travel the land, embark on randomized, roguelite-style expeditions, and build new cities with a fresh card-based building system combined with an intricate resource economy. Rebuild an Empire, not through force of arms or devious politics, but brick and mortar! Raise towering cities using a card-based system. Pick five decks each turn, then play the cards to build upwards. Manage resources like food, water, bricks, wood, stone, and metal, all needed to ensure the city has room to grow and play new cards. As the Great Architect, it's your job to rebuild the Empire, one building and one region at a time. Undertake great expeditions to raise new cities in the Emperor's name and deal with the challenges of each region: Treacherous terrain, resource shortages, and ever-limited building space. Take ownership of every decision and every card played as all buildings are permanent, no redos. Plan around and synergize with imperial citizen’s homes and workshops. Produce more taxes, resources, and maintain loyalty to the Empire - and just maybe the locals will help you with the great evil that lurks among the ruins...