Relatively good.
Looks like we got a review responder here. :] Cool.
The Flash was pretty nice. The characters appeared well-developed and the voice acting was nice. There were a few flaws though. I'll break it down:
Graphics: The character designs were nice, but the bird guys' eyes looked weird when the blinked or squinted (you probably should go with a mask for that), and you didn't use any easing (which you should definitely use with tweens). The mouth animation on the birds, though a nice step from just wobbling, didn't seem to fit. Their mouths just aren't positioned right. Perhaps you might want to redesign their mouth region. The monkey's mouth animation seemed good. I think some frames other than the three normal ones ('ah,' 'oh,' and closed) would be good, like f/v, t, and one with teeth shut and showing.
If you want help with masking or easing, feel free to ask for such in a response, or AIM or Email me.
Style: Style was good. It was unique and pretty original. I thought, though, that the Flash shouldn't've been based around your site. Seemed sorta advertisy almost.
Sound: Sound was also good. The monkey's voice, though a bit on the weird side, fit his character. The birds had fine voices too, but I think they might've been better if they didn't sound so normal (cause their appearance certainly is not. :P).
Violence: -
Interactivity: -
Humor: Kinda funny. The cake mix eating thing was amusing (though you should know - some cake mix is pretty good :D). I had no idea what you were talking about with the cube thing at the start. O_o
Overall: A solid piece. It was enjoyable, and done pretty nicely. There's some room for improvement, of course, but you're doing nicely so far. :]