I read your explanation before i watched it, so it actually made sense to me, but had i not had an explanation i probably wouldn't of really understood it. Either way though, the story was a little weak, but everyone else has already said that and like you said you didn't really have a ton of time to develop it.
I agree obviously with everyone else regarding the whole lens flare/dirty lens issue. Lens flare can add a nice touch in the right shots, but like stated, make sure the lens is perfectly clean or you really do have to reshoot it.
I can't quite figure out exactly what it is that bothers me about some of the shots, but no body else has pointed it out. Maybe you're not shooting fully manual? Or maybe you're just not on manual focus in some shots, but the shots in the beginning where you often have the subject right in the middle of the frame, then leave it to expose a dark background bother me. I know in one of the shots the background immediately lightens up, which leads me to believe you were shooting that on auto, but that's something i immediately noticed and distracted me from the story. There was also another shot shortly after that with hands? or something, i forget exactly. But same sort of deal, but this time the background didn't lighten up, but because the hands were close to the lens, the background had been out of focus. Once the hands were taken out of the shots, the camera immediately racked focus to the background. It's little things like that that you don't always think of when shooting but break up the continuity when editing. That creates a pretty messy transition to the next shot.
I did enjoy the short though, the filming and editing was definitely really good. I really liked the frozen stuff, you did that really well and it definitely has a 'wow' factor to it. I was just being really picky with that last bit but i figured I might as well let you know so you can correct it in the future.