The high quality of production, the cinematography, the soundtrack, the writing, the special effects - all impressive.
More impressive when you realize that this is the Producer's first short film, and that it was made by a group of students as a college project.
It's wonderful what these guys managed to do with fairly limited resources. For me, he mood was set with the lighting. The set was kept very simple, and the use of shadowy, indistinct background scenes added to the tension.
Another thing that really added to the film was the excellent choice of music.
I recommend it as a "good watch", and one that makes you think.