Unnesesarry rise in dificulty of the progression
This game is fine and all but there comes a moment when no matter how many miracles you make you will lose your people, I didnt get to that point but I made the math, I spent everything I had for their happiness (didnt let myself grow the city but made them happier and happier). And in the end of the day I was still losing ( I had a ton of progress btw). The system is you could say rigged, because there comes the moment when you start being reliable on spending real coin.