"Mizu no Hana" was in my opinion a little longbreathed. It contains very few words, I tried to count - about 100 words in the whole film. Due to this, the film was straining und it was difficult to listen and watch it carefully. (The director also said that he has shot the film for adults, not for children!)
Furthermore I really have noticed that this was his first film. It doesn't have the perfection other movies have.