No revenue estimate for GOG — its rating/review counts don't calibrate to sales the way Steam's do. Reviews and prices only.

Kingdom Shell

The magical Shell that has protected the Kingdom for centuries has been shattered. Hordes of nightmarish creatures now overrun the Kingdom, terrorizing its inhabitants. The White Temple, which has stood guard over the Kingdom for centuries, cannot face this threat alone. They are forced to seek help from Elias, a half-blood in whose veins flows the blood of nightmares. He may be the Kingdom's only hope. Explore the lands of the Kingdom, fight hordes of nightmarish creatures and powerful bosses, find secrets, help inhabitants in distress and stop the impending catastrophe. Discover the world of the Kingdom, rich in lore and atmosphere. Stunning hand-drawn pixel art and animation. Engage your foes up close, executing impressive combos, dodge attacks, and strike them with a variety of spells. Meet the inhabitants of the Kingdom. Some of them have rumors that can be investigated. Engage in challenging and intriguing boss fights, with over a dozen in the game, including secret bosses. Explore the Kingdom's world, filled with hidden places and mysteries. Find items, spells, and abilities to aid you in your journey. Customize your playstyle with the inspiration system.