Here's what I understood after watching your short.
Plot - The guy was in a harbour and calling his mom, wanting her to arrive on time. He was anxious of the surrounding, prolly an ongoing tension (an inevitable war?). He was holding in his hand what appears to be a switch of a time machine (but i think it's more of another-dimension-machine?). He became more and more anxious as his mom was nowhere near the meeting place. He looked and missiles were fired off. He was left to no choice but to push the switch to make him disappear to another dimension leaving her mom behind. Fastforward and he was back on the same spot. (How long did it take him to be in another dimension? Dunno) The place was all ruined. Tall buildings were shattered suggesting a large scale war. The first thing he did was to contact his mom but clearly his mom was gone. the scene ended showing the devastated and melancholic look of the protagonist due to the loss of his mom.
Analysis: I'm not really an analyst but here's my 2-cent worht.
First I would say, it's a good concept. Kudos to that. Your color grading is good too and I like some of your close up shots. The actor is very good, i can see the emotions in him specially in his eyes.
But i think the shots didn't explain well what was really going on. Like there were missiles fired but prior to that the surrounding was all calm. I was thinking were those missiles suddenly fired without warning? how did he know then? or did he fire the missil ehimself? since he hit a button prior to the missiles being fired. It may have been better if you shoot some commotion or chaos among the people? (im not sure, just my idea) and that adds more drama and tension to the film and a clear understanding on the viewers.
I don't know if I get it right. Or did i completely misunderstood the plot?
Cheers mate.