im not very familiar with 'girlchan' but...
a review for this almost seems redundant because i know you didn't post this up to express anything artistically, but more as a way to inform people to enter your contest? so i really doubt me weighing out the pros and cons of this flash will do much for you.
i guess my only suggestion would be to add more animation than just a mouth flap moving up and down, and also personally i think the characters voices are insufferable.