1) Short films are defined as original motion pictures under 40 minutes that are often screened at film festivals. They must draw audiences in quickly by compressing narratives and are more likely to have open endings that leave questions.
2) The student's short film "Luna" falls under the crime mystery genre about a girl searching for her missing cousin. It uses unconventional editing between dream sequences and reality to explore themes like life and death.
3) The film has an open ending through the use of an "enigma code" where the audience is left questioning what happened to the missing cousin, similar to other short films analyzed. This leaves room for different interpretations of the narrative.