Game has a big potential to be great but at this moment is all about production. All you need is production focused civics, everything else like science, gold and other will just happen. And important tip: in neolitic era put your tribes on auto survey and split them when they grow. AI seems to know where to scout for bonuses and what is more important: it knows if/when they will respawn.
Yeah, production as a whole needs not even a nerf but a complete redesign, it's insane how easily you can build everything from the medieval era onwards. Production modifiers and multiplicators need to be brutally slaughtered.
The craziest thing is how you have those meaningless infrastrucutres like +3 gold total and then you have cheap infrastructure like "oh you get +2 production per every tile in every territory at once, which means like +60 production for a building you spawn in three turns with no additional cost". So one infrastructure is thirty times better than other for the same cost, balanced

The ability to very easily extract all yields from all territories at onc eneeds to be nerfed very hard, OR made much harder to do, OR have some terrible downsides.
I retroactively officially delete all my comments about Civ games being snowballing and unbalanced, in none of them I casually (without bothering, trying, microing, optimizing and hell even without much conquest) had fourteen times the income of average AI opponent by the end.