I'm surprised one of the top user reviews criticizes the end (last 20-30 minutes) of the film. To me, that part is what took it from a decent film, to a great film. It was artistic yet intense, and just great storytelling. I want to say so much more but I really don't want to spoil any specifics for anyone.
The only negative thing I have to say is on the acting. Most of the characters - the boy, the girl, the drug traffickers - did a good job. But the grandpa, while I actually thought he was a good character, just didn't pull off a lot of the lines in a way that seemed natural. The guitar aspect with him was cool, and his attitude and mannerisms fit the character, but I just think a different actor for the grandpa could have done a much better job. Someone with a little more acting experience and gusto.
The only negative thing I have to say is on the acting. Most of the characters - the boy, the girl, the drug traffickers - did a good job. But the grandpa, while I actually thought he was a good character, just didn't pull off a lot of the lines in a way that seemed natural. The guitar aspect with him was cool, and his attitude and mannerisms fit the character, but I just think a different actor for the grandpa could have done a much better job. Someone with a little more acting experience and gusto.