Collect your star rewards
Don’t forget that, as you collect more and more stars from completing various stages in the game, you can collect various rewards. Tap the top left icon under your player profile and collect them all!
Master each stage for better daily rewards
The game does become idle eventually, after completing the first 30 stages in New York City.
This is when you can start collecting City Tax (resources that accumulate even when you’r enot actively playing) and also the daily reward each day.
The amount of resources you earn is influenced by the amount of stars you have managed to get in all of the stages: if you have at least 2 stars in all stages, you will earn 120% more rewards, while 3 stars in all stages will earn you 150% more rewards.