Let's start off with the positive.
The actors are good. Everyone, in their own roles, play very well.
Technically speaking, this film is well made, aesthetic, and pleasing.
Socially speaking, this is a film that does not take place in any large urban center, without bing completely rural, with is a nice change from the two extremes.
On the down side, the script is horribly poorly written. You can see that the actors made the best of it, but some scenes are so inconsistent that it does make viewing them painful. I found the first scene a very good example of this. I bore with them, but barely.
On an even "downer" side, I do not see the point of this film. I suppose it's some sort of "coming of age", with symbolic value given to fireflies. But I did not see at all what the point was. Coming of age, but to what age? To do what? And how? I cannot, for the life of me, figure out what the point of this movie is, and what is supposed to come across.
In my opinion, this movie is very forgettable, and will add nothing to your life, to you, to anything. It doesn't tell any entertaining story, nor it doesn't give you any perspective on anything. This might be a result from, or linked to, the poor script writing.