It'd be nice to see more early game content for tech progression. I don't know if you guys have seen this channel before, but I think it'd be good inspiration.
This is not my youtube channel. I just think the stuff in it seems relevant to what might be some good ideas for early game progression.
That having been said, specifically, more primitive shelters, storage, and more working with clay would be good to extend gameplay early on.
The tech progression for early game feels incredibly quick. I think there should be a bit more work to say, making a sawblade?
Additionally, this would make getting seeds early a bit more challenging, which would reward hunting as the early game food option more rewarding-- adding fishing would improve early food options, as well as provide a meat source which does not necessarily have to be cooked over fire.
A sling as an early weapon would be excellent in that players feel more empowered by having a ranged weapon, it wouldn't deal an amazing amount of damage, and it gives a use for the large supple of stone most players end up with while mining. (As a side note, three hits to kill a pig is unrewarding.)
Some foods should require more preparation, (potato comes to mind) but foods which have have no need for preparing might benefit from having the option of combining. (Think salad.)
Love the game so far!