i have an idea: what about making a "Upgrade your character" menù?
You could use souls as a currency to improve something like "max % of gold bonus" or "starting click bonus" or "starting dps bonus" or something strange you would like!
what do you think about it?
 "Guild Quest - Beta"){kind=icon}
 "Clicker Heroes"){kind=icon}
 "Heir"){kind=icon}