There are 2 revenue streams in the game: in-app purchases and ads.
Users purchase gold in order to buy game products:
buffs and upgrades.
We incorporated awesome heroes so now users can either purchase them or open at certain levels.
The app is integrated with Fyber and Appodeal mobile ads mediation services. This services provide an access to the best ad networks (Chartboost, AdMob, AppLovin, Amazon Ads etc.)