So go ahead. Download the premium edition. Unlock every hero. Max them out. And watch the invaders of the Frontiers crumble at your feet.
If you have $10, buy the Steam version—it is the actual legitimate "Premium All Heroes Unlocked" version and supports the devs. If you are on mobile and cannot afford the $30+ hero bundle, the modded APK is the only way to access the full roster without spending real money. So go ahead