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.

Requiem: Avenging Angel

Requiem: Avenging Angel is a 3D, first-person action game of biblical proportions set in a world under siege. A holy war rages on Earth between Heaven's Chosen Soldiers and Hell's Fallen Angels. You are Malachi, a Chosen Angel, sent to Earth to save Creation from the wrath of the Fallen. Blast your way through an immersive futuristic 3D world developing Angelic powers like possession, blood boil, locust swarms, and the ability to turn your enemies to pillars of salt. Without you, mankind doesn't have a prayer. All the heart-pounding action of a top shooter, with a rich story line and realistic character interaction Fight demons and hell's minions using rare angelic powers, including: Bloodboil, Lightning, Flight, Holy Light, and Turn to Salt Take up arms against the dark horde of the Fallen and utilize 7 unique weapons of the plane of Creation, including: the “Trinity” Combat Shotgun, “Beelzebomb” Grenade Launcher and “Revelations” Railgun