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 $1.6M — a different platform, not this one.

Maximum Action

MAXIMUM Action is a brutal and satisfying physics-based first-person shooter influenced by Hong Kong action, heroic slow-mo bloodshed, and old-school FPS ACTION . Dozens of weapons ranging from knives, pistols, SMGs, ARs, shotguns, rifles, grenades, crossbows, bazookas and even katanas, ALL at your disposal. Every one able to be duel wielded. Jump, slide, dive, punch & kick your way to victory. Slow down or speed up time at your will, grab weapons out of midair and gib your enemies in an endless number of ways. Spawn any weapons you want, play however you want. ACTION TO THE MAX!