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 $10.8K — a different platform, not this one.

Space Grunts

In the year 2476, Earth's space federation has been building moon bases across the galaxy. One of those moon bases has been sending a distress signal. Space Grunts are a group of intergalactic "problem" solvers, sent to investigate..    Pick your type of Space Grunts: Leader, Enforcer, or Tech junky, which will have an impact on items, weapons, and the environment. And start your mission: find your way into the moon base, and figure out what has happened. You'll have to fight your way through aliens, robots, security drones, and base systems. Find the lower levels of the moon base, and get to the core of the problems.    Consumables - A large collection of consumables can be found all over the moon base from weapon enhancers, to destructive toys, armor, explosives, system hacks, and more. Use the items wisely to advance deeper into the moon base.  Weapons - Starting with three standard Grunt weapons, you will be able to enhance them for more firepower and range. On your way, you'll also find alternate weapons and melee weapons.  Secrets - There are various ways to complete the game, anomalies leading to weird places, underground routes, and mysterious items to transport you to other areas of the moon base. On top of these, there are secret rooms and areas located all over the base, so never a dull moment!  Can you find the core of the problems?