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 $18.2M — a different platform, not this one.
Total War: ATTILA
Against a darkening background of famine, disease and war, a new power is rising in the great steppes of the East. With a million horsemen at his back, the ultimate warrior king approaches, and his sights are set on Rome… The next instalment in the multi award-winning PC series that combines turn-based strategy with real-time tactics, Total War: ATTILA casts players back to 395 AD. A time of apocalyptic turmoil at the very dawn of the Dark Ages. How far will you go to survive? Will you sweep oppression from the world and carve out a barbarian or Eastern kingdom of your own? Or will you brace against the coming storm as the last remnants of the Roman Empire, in the ultimate survival-strategy challenge? The Scourge of God is coming. Your world will burn. Apocalyptic destruction mechanics Wield the ferocious power of fire in battle to set buildings ablaze and terrify defenders, or wipe entire cities and regions from the face of the campaign map with the new raze mechanic. Legendary start position Playing as the Western Roman Empire you will begin with vast territories under your control, but weakened by political in-fighting and threatened on all sides by enemies, your dominance will quickly become a struggle to survive. Overhauled game mechanics Improved core gameplay and UI through the latest optimised and modified Total War game mechanics, including politics, family tree, civic management and technological progression. Incredible period detail With new period-specific technologies, arms and armaments, religion, cultures and social upheaval, Total War: ATTILA delivers an authentic experience of this ominous chapter of our history. Outstanding visual fidelity Improvements and optimisations to both campaign and battle visuals create a chilling vision of a looming apocalypse and the ruin of the civilized world. With breath-taking scale, atmosphere and improved graphical performance, witness the end of days and the rise of a legend.