Very good first flash
Here are some things I was thinking while watching your movie:
-You made a lot of references to other movies or TV show (South Park, Shaun of the Dead at the begining when a guy walks outside, Forrest Gump). Really nice!
-You don't have to specify what you drawn. A couch remains a couch, even if it's badly drawn. A picture worth more words than a word. Next time, work harder your pictures.
-The voices were hard to understand... maybe subtitles wouldn't hurt.
Keep on the good job! ;)