Wonderful little game.
A few observations from this demo:
1) QOL: Click and hold to unlock fossils feels drawn out, even when I had less than 4. On the assumption you'll find more ruins, I could see this being a bit of an annoyance.
Suggestion: Shorten/remove the timer or allow all fossils to be opened/cracked at once.
2) This may be me being dumb, but I couldn't see the increased housing limit reflected (or I have not unlocked it yet)
3) The ship: Sure this is probably in the pipe line, but would love it to be automated, assigning a "harbour master" to move/sell goods.
Honestly, you've done so well with the game play loop - it's engaging and for me not too fast or slow. Nailed it mate.