One thing that bothers me a little bit is the lack of some sort of banking option. I'm not saying have a bank or ATM suddenly appear in town, but perhaps maybe add a piggybank to the game? It'd make things easier for folks like me with poor impulse control. I'm not even saying have it available from the start, perhaps make it something you'd get as a gift from one of the townsfolk, or perhaps a reward from purchasing Xg worth of good from Pierre's? Having it a purchasable furniture item from Robin's seems a bit dicey, as that'd basically have you relying on RNGesus to smile upon you, so making it some form of benchmark item seems the best bet.
I kind of like the idea of a bank being put in the game, like Pierre starts to branch out to beat the competition and opens a bank or something like that and maybe the possibility of accumulating interest along with it (like Animal crossing)