What a wholesome game, I really liked the little poems at the end of each level. The art is pretty, the visual style is clear.
I think the main improvement would be to adjust the areas or just find a way to better indicate where the sweeping / pruning / etc happends, because I often ended up wasting seconds before I realized nothing is happening. Also, there could be some indicators that point you to where the dirty objects are, because I had to constantly go up-and-down the screen to be able to spot then,
But these are just minor suggestions for improvement, the game was really fun as it is.