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 $7.9K — a different platform, not this one.

Lumo

Witness the rebirth of a genre in Lumo – a classic isometric adventure with a modern twist for gamers young and old alike! As a contemporary take on the long-lost isometric platform genre, Lumo can be enjoyed by anyone looking for an absorbing, challenging and rewarding adventure. But for those who lived through the golden age of videogames – the 80s and early 90s – or know about the games and culture from that time, layer upon layer of nods, winks and touches to those times help build upon an experience that’s as heart-warming as it is exciting! With over 400 rooms across four unique zones, six hidden mini-games and all kinds of secrets to uncover, Lumo is a true voyage of discovery. How much you discover just depends on how hard you look… Lumo revives the long-lost art of isometric platforming, while bringing a charm of all its own to the genre. Over 400 rooms will test your skill, each one a self-contained challenge to overcome. The more you look, the more you'll find – from a hugely absording adventure on the surface to all kinds of secrets to find underneath! A true love letter to the golden age of gaming… adventures don't get much more heart-warming than this!