One inhancement I don't think anyone's mentioned yet that I would like to see is a click spot in the shop where you could see how many decorations you've purchased. There already is a spot to see how many plants you've purchased so I doubt that would be a hard thing to add.
It would be great if once you bought something it showed up on a shelf in the store, so you knew exactly what you've purchased, but that might be a lot of work.
P.S.
I just REALLY want to see an add-on pack or a version 2 of Fish Tycoon SOON, no matter what it has!

Marcey