You get soul by earning money, the more money the more soul but you can't win the final upgrades are too much. You can't reach it with compound interest nor millions of years...
You can't win. I spent a million year with hundreds of billions of soul but couldn't upgrade everything... It's so sad...
Don't play this game or you will feel sad and incomplete too.
 "Overlod"){kind=icon}
 "The King of Towers"){kind=icon}