I have just finished watching this film, about 5 minutes ago.
It is very hard for me to speak of this film with kind words, the only good things I can say is that its well shot and well acted. However this is where the positives stop. The plot is poor and its not terribly well explained either, sometimes this is good as it allows for personal interpretations, however with this film it doesn't. There is only one interpretation.
For me the plot takes an age to get going and when it does it goes to a place I wish I had never visited, then completely fails to justify the actions of the characters in the final scene. Its just poorly explained.
If you want a good psychological horror/thriller in the spanish language, watch KM31 instead.
Maybe some people will like this film but I really don't know why. The soundtrack was repetitive and at times didnt add anything to the mood of the film.
Overall, its 90+ minutes that I consider well and truelly wasted.