It's set entirely in the ancient time period instead of having multiple ages, which I find this to be a strength since units and technologies remain relevant throughout the entire game. Also, ethical sales practices: the base game is very complete and DLC only adds small changes unlike most games in this genre (looking at you Paradox). The game's also on GOG, which itself is a green flag in several ways.
The developers are active daily on all support channels (Discord, Steam, forums etc). I've seen people attach saves asking for help, and a dev always respond a couple hours later in great detail.