Sorry, didn't like it
Graphics: better then usual. From the other flashes I've seen in this series, it seems like your style usually involves more static drawings with only the mouths moving or something along those lines. This time you included a lot more FBF animation and detail, so I'll give you credit there. At first the houses looked like they were taken from Google image search and you used a photoshop filter to make them fancy, but then you actually started drawing the houses as the flash went along. So the graphics were a step up.
Style: I can't help but feel this series has just a little too much adult swim influence. The content itself is sort of original, but the blatant ripoffs of adult swim characters turned me off. That one guy sounds and looks exactly like Carl from Aqua Teen Hunger Force... he also serves no purpose to the plot other then to tell Blockhead what an idiot he is. Also, is he in Blockhead's mind? Or is he just imaginary? Or is he God? Why the hell does he show up everywhere? Sorry, I haven't watched much of the series before this. IMO, you could get rid of that character entirely and have a much better series using only segments like the first scene in this flash.
Sound: The voice acting was somewhat annoying, and it really ended up getting on my nerves and ruining jokes that might otherwise be funny. I also found the singing to be so annoying I could barely keep myself from closing the flash. I would suggest toning down the performances a little bit, they just seem too over the top and goofy.
Humor: I dunno, it kind of seemed like you were trying too hard. Maybe its just me, but the humor seemed a little forced. Making something random happen just for the sake of something random happening doesn't cut it for me. I'm sure a lot of other people find it hilarious when Blockhead uses his tongue to grab on to shit, but I don't quite get what's so appealing about that sort of thing. It also goes back to the adult swim influences, and it seems to me you're trying pretty hard to match that style of randomness. Of course, I hate a lot of adult swim shows that try to do the same thing you're doing here too. Whatever.
Overall: Just not my cup of tea. For me, the good graphics weren't enough to compensate for the annoying voices, unoriginal style, and forced humor. Good luck in the Halloween contest though.