This game was incredibly charming, I especially loved the Watering Can character. I'm also impressed you used RPG Maker for this, as that's not really the ideal engine to use for a game like this.
I will say, I agree with some other comments that the watering part takes a long time. It doesn't help that the snail make it take longer either. But I can see how that's part of the challenge. I think being able to jump would have added to the experience, but I understand that probably would have been hard to implement with the engine you were using.
Overall, you really did create a charming feel to your game and the idea was original. Great work!