Expectations
I don't know what it is really, to be honest. The more I watch flash movies, the higher my expectations get. I'm not at all saying your flash movie wasn't good. Honestly, I don't animate, I do voice-acting, so I can't rip on your animations (which didnt seem to have anything wrong with them, past the fact you can call something part of your own 'style') but it was fluid to say the least.
So, I'll get right to the 'expectations' part. Your animations were fine, sound/voice-acting was crisp, but it wasn't the packaging that was sub-par, it was the content. Quite frankly, the storyline and dialogue don't grab me at all. Once the demon started explaining the 'tablet' thing, my attention span went out the window. To be blunt, that part was boring.
Also, the jokes in there were only mildly funny. Another thing when you've seen so many flash movies is that you tend to see a lot of different jokes and cliches thrown around, but after awhile, some people need to see something really original. There are those out there still young and seeing everything for the first time. Those were the best times, when everything seemed funny.
What you need is more substance, something with more bang for your buck. The problem with short term production (about 3 weeks was it?) is that usually, when people don't have a lot of experience writing scripts, and no one to bounce ideas off of, sometimes its hard to judge how funny something really is. While you look at a show like South Park (yes, I know, a wide comparison here, but its only an example) they produce their shows weekly, with no forethought into each episode beforehand, but because they're skilled writers and are many writers, they can pull it off. Thing is, flash animators can still deliver the same quality as that themselves, it just requires more time, refining and practice.
I know deep down you've got a hell of a lot of potential. This was okay, but it can be even better, it can be awesome even. But take a little more time producing each episode, because while a quantity of episodes will keep fans entertained, only quality will truly leave them satisfied.