Frostpunk is a game with a very narrow premise; cold is the enemy, exploration is necessary, and building is the weapon. It hints at a steampunk setting, but the setting is a thin veneer; the excitement of the game only works because resources are very limited and exploration of the unknown is a huge factor.
Most building games assume that the player will spend many hours on a single city. Most strategy games assume that the player will start out with an unknown map and conquer it by exploration or warfare or both. Frostpunk is not like SimCity or Civilization. Frostpunk can capture the imagination precisely because the player is surrounded by a snowy wasteland that must be explored for vital resources. The food gathering mechanic only works because freezing to death is a more immediate fear than starving to death.
I played Frostpunk only because Anno 1800 was not available. However, Frostpunk is not a typical strategy game. Frostpunk is short and challenging. It definitely does NOT replace more conventional strategy or tactics games, but it is a remarkably entertaining little game for the few short hours that it has.