Really original idea. The music and atmosphere made me want to keep playing the game. I really like the speech bubble/heart and sfx for a successful delivery :)
The flower art could be improved a little to make them stand out from the back ground and from each other, as well as the different grwoth stages. Since picking the correct amount of each flower is the goal, being able to tell which type of flower is around you and which flowers are fully grown is key to winning. I also couldn't tell when I could walk over a flower and when I couldn't - again, I think this could be signalled more via the art.
Art improvements aside, I liked playing this game!