After all puzzles are solved, all tech acquired and cave is open: What's next? Is there a way to get the villagers to explore the cave or is it time to buy VV2?

You can play at a harder level try to do it faster or get all scientists or builders. At that point though i just bought vv2 i like that one better because you can try to breed certain genetics.

I decided just to keep the tribe living and to try to dominate the high scores!

I just keep playing to keep them all alive

you cant explore the cave more than reading part of the story, but its fun to see how high your scores get!!