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 $2.9K — a different platform, not this one.

Parkan: Iron Strategy

Enter the futuristic worlds of The Labyrinth, a system of portals that connect planets belonging to unknown star systems. Confront mechanical hordes of rebels and inhospitable alien fauna. Control a squad of battle robots on a battlefield and issue orders to mobile units from inside a well-protected bunker. Create thousands of different battle machines and control them either remotely or from a first-person perspective. Parkan: Iron Strategy is a perfect mix of advanced real-time strategy and futuristic warbot simulator with FPS elements in a highly realistic environment. 20 single player missions, which form a series of epic scenarios involving action, simulation and traditional real-time strategy. Hours of gameplay in 6 hostile worlds, each with their unique environment. Superbly detailed futuristic landscapes, day and night alternation and realistic weather effects. Multiple views available including first person from any robot perspective. Thousands of possible robot combinations: bots can be airborne, groundbased, wheeled or on tracks, all with a huge choice of weaponry.