Takara Tomy's RPG Piggy Bank: level up by saving up

Now here's a novel concept. Takara Tomy's BankQuest is half piggy bank, half old school RPG. Essentially, gamers / penny pinchers can purchase items to help them fend off pixelated ogres and the like by saving more money. The more coinage that gets deposited, the better the journey becomes. So, do you get some kind of prize when you cash it all out to buy your mum something nice, or what?