Awesome to hear! A few ideas, just spitballing off the top of my head:
-option to turn off music but keep sfx (you can see this upon pressing the home button)
-the "1x" vs. "all" option in the store, but for all items, not just flowers
-random chance that upon breaking a rock, some money appears (gold coin or similar)
-rare occurrence of an item-in-a-bottle appearing on the shore. maybe something to sell for large $
-different crops to grow, with different gestation periods and prices associated
-buying food for animals and making sure they're fed
-fishing in the pond, with different probabilities to catch different fish
-rare chance to get "golden berry" or similar while harvesting berries
-dungeon area with enemies / sword to upgrade :)
-start out with only a bed, and you buy furniture for your house over time
-hunger mechanic (there are consequences to sleeping while starving)
-upgrading tools, etc. takes significant resources (a few tweaks like this to make the game stretch for hours)