Just click on the coin. You will get some money. Starting cooldown is 3 seconds and reduced by 1 second each purchase. Once you get enough coins, you can buy the upgrades. Currency upgrade cost is 3 times that of what the currency you unlock is, i.e. For the 15C upgrade you get 5C coin and 60C upgrade you get the 20C note etc.
Biggest Update So Far! However, this game is currently only in release phase, and you might encounter a bug where you can't click the currency... But this is not 10% of what I expect the final version to be. Please give me your responses and suggestions in the comments :D
