There are a few things...
First of all there is no animated background. Just pictures. Which don't mix to well with animations. Nothing turns out well when you mix qualities. If you can't resist but use pictures at least have the quality of the pictuers good.
You really need to fix that elevator. It disapears after the first time you see notice it. Something went wrong? Not something to worry about, but should be fixed mate.
The voices seemed dull and uninteresting. You need to put more feeling, or get your friends to put more feeling into what they say. You need to feel the motivation in the speech.
There is no syncing of the lips. I noticed that when they talk, there mouths don't move. I feel that not much effort was put into this, but you did in fact try. I sense tweens. Lots of them actually. Tweening is probably what helped you through making this.
The characters didn't seem bad though. They were animeish and that's what most people like. They were a wee poorly drawn, but still look nice.
What my opinion is that most of the flash is about simple little tweens, small jokes, and little drawing.
You can do better. I didn't see much in this, but there is more you can do. More you can accomplish. Keep animating, you sure have an eye for plot. I found the story not too bad actually. It had some funny in there. But basically just improve on your backgrounds and your animating. Don't take the easy way out.