https://www.gamespot.com/articles/steams-new-hit-game-frostpunk-is-off-to-a-fast-sta/1100-6458574/

Frostpunk is a striking game, with a beautiful and haunting aesthetic and a novel premise. The post-apocalyptic city-builder has consequently launched to critical acclaim and, as it turns out, pretty great sales numbers. In less than three full days, Frostpunk has already crossed the 250,000 copies sold milestone.

In an email, developer 11-bit Studios revealed that after only 66 hours, a quarter of a million people purchased the game. These are good first-week numbers for most games, and they are fantastic for a medium-sized independent studio like 11-bit. The developer has already covered development and marketing costs for the game as a result of this early success.