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 $8.5M — a different platform, not this one.

Warhammer 40,000: Boltgun

Discover the grim dark universes of Warhammer where there is only war. From Warhammer 40,000 to Warhammer Fantasy and more - discover it all on GOG Warhammer Franchise page . Load up your Boltgun and plunge into battle headfirst! Experience a perfect blend of Warhammer 40,000, classic, frenetic FPS gameplay and the stylish visuals of your favourite 90’s retro shooters.  Play a battle-hardened Space Marine on a perilous mission across the galaxy, as they battle against the Chaos Space Marines and daemons of Chaos.  In glorious boomer shooter style, unleash your devastating Space Marine arsenal as you blast through an explosion of sprites, pixels and blood. Run, jump and charge across huge levels to shoot, shred and slice the worst heretics across the galaxy!  • Dive into a visceral combat experience, complete with viciously satisfying gunplay, high mobility and buckets of blood to reward your skills  • Dominate the battlefield with the awesome firepower and heavy metal of a Space Marine’s devastating arsenal  • Experience the ultimate homage to retro shooters, blending stylish visuals with fluid, modern FPS gameplay • Annihilate endless swarms of enemies in the new horde mode, available for free. Blast each and every heretic standing in your way, trample on their remains and cleanse their foul heresy.