Yes, I have indeed played for a while, and based on my experience playing 0. A.D, it is a good game, but I always feel like something is missing. If I remember correctly, the introduction says that 0. A.D selected a time period from 500 BC to 500 AD, which is the period from the Peloponnesian War to the downfall of the Western Roman Empire. Basically, this time period covered all the civilizations of the Old World, But it seems that there is a lack of civilizations such as Kushans, Germanic (including Goths, Vandals, Franks, and Burgundians), Huns, Xiong Nu, Scythians (or Alans, mainly early nomadic peoples), which theoretically could have appeared. However, the current version lacks their place, and I think a new version in the future can make up for them.