Hello developer, as a fan of this game I would love to see it on steam greenlight. Of course since this game is already f2p it would be free on steam but it could increase the game's popularity. On top of that you could add dlc with story after the main story and more groups to choose from and fight.
You should add the ability to split up resources randomly through selected upgrades in all the upgrade screens at town and in battle. I have a hard time choosing what to upgrade because there are so many upgrades I need but there isn't an easy way to do all at the same time. If you add this there should be way to set priority upgrades among the ones you have chosen so that 100 resources don't go into an upgrade you chose but don't want many points in. Finally, you should add a way to auto place points into selected upgrades with click of a button.