I'm only a bit in (having just discovered this), but in some ways, it reminds me of a kind of "Settlers of Cataan, but different" sort of game, what with the seeking resources, building up forces and goods, and acquisition of victory points.
The major difference seems to be the the three stages/eras, and separate/individual "boards" for themselves.
So... maybe Settlers of Cataan minus the central board, spiced with a few mechanics from Dawn of Worlds and/or Magic: the Gathering, though the latter two influences are comparatively minor?
I'll probably ask more later, but I'm unsure if I can watch the whole of it tonight - it's interesting, I've just got actual family stuff! :D