Just beat the game with 72 people! I didn't read your page fully so the end was a fun surprise! I had no problems figuring out to click for resources, but it took me a while to figure out that mines/lumber yards give out.
Some things that might improve the game:
-notification somewhere when a mine/lumber yard has run out.
-notification when at least the first pirate ship comes
-notification when the next harvest/time to feed your people is
-escalating pirate numbers or difficulty (the game was quite easy once you built the first tower)
-maybe the ability to put certain resources into the ship?
I don't know, those are just off the top of my head.