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 $65.3K — a different platform, not this one.

X-Com: Enforcer

X-COM: Earth's top-secret eXtraterrestrial COMbat unit The Place: America - early 21st century The Mission: Eradicate the extraterrestrials Alien forces have invaded Earth and are terrorizing the population. To combat this sinister threat, a lone X-COM scientist has created the Enforcer, a high-tech fighting machine made of earthly robotics and scavenged alien technology. Armed with the latest high-powered weapons, the Enforcer is sent into alien hot spots to fight in adrenaline-charged battles that rage on city streets, across rooftops and in the sewers. YOU are the Enforcer. Powered by the same game engine as Unreal Tournament™, X-COM ENFORCER™ puts you on the front line of an alien attack.