Long Live Death! (2014)

Directed by Sergio Castañón

Aurelio is an eight year old boy whose mother is very sick. One night, he sees her crossing a door, when he follows her, Aurelio finds himself in the world of the dead. There, he finds "La muerte" (The death), who then becomes his mentor and helps him finding his mom. When he finally finds her, he must decide whether go back to his world or stay there with his mom.