Nice...
I can't say whether this should be stand alone or not. Either way, this movie is pretty damn funny.
If you make something outta this, I'm sure the rest of us will appreciate it. Making a series (seasonal or otherwise) would make this an internet icon, for sure.
On the constructive side, the flash has a great sense of timing, the colors and shading are pretty grand-spanking awesome for flash(and a fast job). The voice-acting is pretty cool too(you and that other guy were really into it, which pretty much made teh movie, in and of itself). The only suggestion I have beyond above is some sort of interesting loading screen and/or replay screen.
Hope this helps! Have a Happy Hallowe'en!