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 $106.6K — a different platform, not this one.

Slave Zero X

From the top of Megacity S1-9, the Sovereign Khan rules with fists of iron and flesh. Beneath the city’s rotting foundations, a vengeful warrior embarks on a journey to murder him. 4 years prior to the events of Slave Zero, Slave Zero X brings new life to a world where horrific, living machines known as Slaves are primed to become the latest tools of war in humanity’s long and bloody history. A secret band of warriors known as The Guardians hope to stop these biomecha from being unleashed upon the world, but one swordsman among their ranks has a different idea: use the enemy’s own weapon against them. By merging with a stolen Slave Unit Prototype, Shou will become a furious Devil in pursuit of killing a false God. KILLER COMBOS: Use swift swordplay, explosive ordnance, and stylish combos against an army of meat and metal. DEATH FROM ABOVE: Air juggling, dashes, and frequent target switching allow for you to take down foes of any size while wall-jumping and platforming can help you outmaneuver your enemies. FIGHT FOR YOUR LIFE: Conquer mini-bosses, set pieces, and climactic 1-on-1 encounters that offer intense challenges against unforgettable villains. STRENGTH IS NOTHING WITHOUT CONTROL: Use the Training Room to hone precise and powerful moves to string together devastating attack sequences. BATTLE TO THE BEAT: A 90s-inspired soundtrack features heavy Drum’n’Bass and funky industrial music that adds to the thrill of combat. FEAST YOUR EYES: A unique visual aesthetic combines nostalgic 2D sprites with an advanced lighting system and stylized 3D environments. THE END IS NEVER THE END: After completing the campaign, further challenges await in an expansive and frenetic ‘Bloody Palace’ procedural challenge tower with an online high score leaderboard. May contain content inappropriate for children.