If this is your first film, you should be proud of it! The dialogue worked well, but the acting (and sound quality, to a certain extent) let it down. The editing was solid, but not that adventurous, and I think the man's emotions could perhaps have been emphasised more with different cuts - but as a beginner, you've evidently already covered a lot of ground and will only get better.
The prison set looked really good but I'm not sure if the lighting setups and camera angles you choose made the most of it. While I understand how difficult it is to work with minimal crew and equipment, in some cases you could have shifted the light and/or camera a fairly small distance and achieved much more cinematic shots.
I'll post a couple of examples to show you what I mean…
What I would do: move the camera round to the right slightly, so the man's head isn't being cut off by the pillar, but leaving more room behind him than in front as you have done (intentionally or not) to show he has been cornered, so to speak. I'd kill the light on the front of the bars, leaving them in silhouette, as otherwise they take attention away from the actor. This would also leave the intern in silhouette when she enters, letting the audience ask a question, and answering them in the next shot.
If you move the intern across the screen (about a third from the right) and make her face slightly to the left (her right), the shot will seem much more natural. It's good that she stands out from the background, but she's a bit overexposed. You could move the light further away, put it on a dimmer or put something in front of the light to reduce its intensity.
I like what you did with the intern on the wide shot - it doesn't match up with the close up, but it looks good. Perhaps a combination of the two - lit from the side/behind on both but with a piece of white card/foamcore to reflect some light in the closeup would've been a good compromise. Finally… that dolly shot from the doorway was really smooth! Nice work on that.
I've rambled on a bit, but I think you've done really well for a first film and I look forward to seeing you get even better on your next project