Looks like it could be decent but....
This is my personal opinion but i reckon it would be better if you did a few things:
1. Remove the beak/arrow thing when they talk. It ruins the looks of the characters in my opinion.
2. Flip the wings(?) of the bat. They look like they are coming from it's rear.
3. Remove the background on the images (of the pigs and squirrels.) If the normal bats weren't drawn to a nice looking standard i would of thought it was a no effort job flash.
I shall give it a 6/10 as it has potential to be something nice. But needs more work for the next episode.