I can't increase my population enough to progress, and my people keep getting killed from attacks. The game doesn't explain how to increase population growth rate.
The "Earn 500 coins in a single adventure" badge is not easy. Not sure who decides on the level of difficulty for badges, but that person screwed the pooch on this one.
The gold metals, especially the skull collection ones, make this game too annoying to really enjoy. I like the game, but the metals are just plain rubbish.