It's niche. But if you like a slow burning exploration game that doesn't hold your hand then you'll enjoy it. .I know I certainly have for the 10 hours I've been on it, and I don't think I've really scratched the surface. However if you want to go from discovering how to hold a stick to building a house this isn't for you. The game currently goes from 10,000,000 years ago to around 4,000,000 years ago from what I can tell, so you won't get any technological advancements, though I believe there will be scope for a couple of sequels, providing the game exclusive enemies don't user rating bomb it out of existence.
I enjoyed it, and will play it. It might not be a huge money spinner as it is pretty niche, and I hope that doesn't discourage the developers of continuing because I would love to see where this goes.
Go watch GameRiot and other youtuber series to see if you'll enjoy it before buying, because it is definitely not for everyone.