Cute game!It took me a bit to understand how to buy new plants. Not sure if it was covered by the tutorial and I missed it or if it wasn't there at all.
Another thing I noticed is that sometimes I fulfilled an order but the plants didn't leave the shelf, duplicating the amounts of plants I had (1 that "fulfilled" the order and the one on the shelf).
It would also add to have some indication of the level of growth of the plant as it is not always apparent.