Well, i played this and i don't actually know what i was playing.
First there is a grind, quite a bit of it.
Normally i wouldn't mind grind, but only if it will reward with some benefits and if there are others gameplay element already in place.
Here it seems grind is for the sake of grind and there is little else.
You go around and collect pimples from raccoon asshole and dig forgotten bones from sand. You could also go fishing, just only to discover what in there. You can catch dead fish from underground area? Super-cool, put them into the pile with the rest of junk and never return to fishing again.
Base building? Haven't notice any, you just litter stuff around as you go, except maybe it is good idea to put everything into one place to reduce galloping around, and, i suppose, this place could be called a base.
Or maybe they mean this fast travel flag thing? Nope, this is just a pole you stick on cliff edge and then fast travel there, that's how you climb places.
Survival game? Not sure if i should care about those natives. They live in separate tribes, you would think they will have territorial disputes or something, but they all united against bigger threat - arrived player. I think they are doing fine to be worried if they survive, i'm sure some of them will.
There are some cool things, like raiders can kidnap your party member and then you get rescue mission, or you can attach robot's head to your frankenstein's monster so she will shoot lazors, pretty neat.
Kinda feel like i have seen all this game has to offer.
and where is the place where i can farm diamonds? There is hard requirement for chaos wood to progress story at some point; you gonna make chaos axe to chop the wood, and for that you need diamonds. And the only place to get them is this underground - you spend 20-40 min scavenging that damn place only to find 1-2 or even none of those diamonds you need, which is ridiculous.