I watced this movie because I liked a view of the world of "Moon" made by same director as this film.
Since sci-fi movies can give me strange feeling and make me moved somehow,
I like those kinds of movies.
It was not so long that I could concentrate on the story.
Most of people wrote about the pararell world in their reviews, but actually I'm not sure what is that.
Although I could understand a cruel experiment and what the main charactor tried to do.
I would say the ending was kind of weak.
If it finished at that scene (it could be spoiler), this film could be more impressive.
