Nice effort
Well, regardless of the time spent, I think it's more critical that you learn from the responses to your movie now. Don't let score keep you from learning from this so you can make your next movie better. I agree completely with Seaspray and also feel you should tone down the flashing screen. Closeups on faces with moving mouths should only be used as a story telling device. If you can't accompany some kind of vocals or text with it, then it becomes extraneous.
ex. 1. You have a close up of a guy laughing and saying "heh heh, I bet that punch hurt".
or
2. You can show the guy getting punched and then the guy laughing.
They both tell the story, it's just up to you as the director to decide which to use. In the case of your movie, you used 1 fairly often, and didn't include the words which throws everyone off. Anyway, good luck on your next piece. :)