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 $22.5K — a different platform, not this one.

Fossil Echo

Fossil Echo is a short and challenging, story driven platformer with hand drawn 2D graphics. Set in a fantastical world, it tells a wordless tale of adventure and mystery. ​ Influenced by the Oddworld series, Ico & Shadow of the Colossus, as well as Studio Ghibli films, Fossil Echo tells the story of a young boy and his journey to climb a giant tower in the middle of the sea. How he got there, and, more importantly, Why? are questions that will be answered via playable flashbacks during his ascent. And for those willing to meet the challenge, eight temples offer some insight on the game's lore and back-story. Varied and detailed environments Hand animated 2D characters Over 15 minutes of fully animated cutscenes A wordless, mysterious story Breathtaking orchestral score Very dynamic and demanding platforming gameplay Tense stealth mechanics Well hidden secrets and unlockables No HUD or on-screen indications Speedrun-Friendly (in-game timers...)