I would give it 4 stars. The characters plus character development was good, further more the scenery was also good, plus the story and all the other elements were really great in my opinion. It was very funny, and I enjoyed it a lot.
In my opinion i would give it 4 stars because its funny and it tells of the culture of dia de los muertos and why we celebrate it ( at the begining) and it has its own storie of a boy who enters the "land of the dead" and then he has an adventure.