I thought it was generally well done - just the length aspect was fairly impressive. Creating a 45 minute film with decent pacing takes a lot of time and work.
The cinematography was pretty good and got better towards the end. My favorite shots included the slow pan from behind the fan in the silo, and the long shots at the end. The final shot was well framed.
Some criticism - dialogue could have been louder and crisper (intelligibility above all), acting was varied in quality, too much narration, and the music was stolen from Road to Perdition. Come on, make your own. The Celtic-influenced music really helped the movie, but I'd be more interested to see how good it was with original music.