I am ready to buy level 3 either building or spirituality, trying to decide. So far I have a population of 19, only 4 deaths and they were early on. I have level 3 harvesting and Medicine and level 2 on the rest, but can't decide if my village needs building so it can populate or Spirituality to feed their souls? Any thoughts? No Spoilers, please

What you choose will determine the order that you will be able to complete certain puzzles, but each Village Tech level provides some advancement toward completing the game. I usually look at the way that my village is going and what I've accomplished so far before I make the decision. Dragging an adult villager around the island and noting what they observe can help you. Just look at what they see and try to determine which Village Tech would be most useful in that situation.

Thanks, that answers it for me as my villagers are very interested in mysteries