A really solid concept, and a great entry. I liked that you picked between two randomised tiles to alleviate some of the bad luck while still maintaining a sense of randomness.
Like mentioned below, the total population could probably be indicated at all times. Another thing to note is that 100 turns feels like it's too many (at least for the current gameplay loop). I stopped after 38, because it felt like nothing new had been happening for quite a while.
Anyway, overall a really nice game. Well done!