Nice job.
Overall, I enjoyed this animation. I liked the sense of humor throughout it. There a just a few places where I think you could improve quickly and easily that would result in a better product by episode two. First, I think you should get a better microphone and better editing software. Audio peaks detract quite a bit from the mood of a scene, and they can be pretty easily avoided. Which leads me to my next comment: When Sherbert and Pokes were charging each other in the fight and they were yelling, it sounded like they were actually just whispering. It really sounds like they were trying to make a yelling sound while being quiet so as not to disturb neighbors or a baby or something. If you don't quite get what I'm saying, listen to that part again. The same thing can be said about when Sherbert is drawing the water, yelling for someone to help him. The best way to fix this problem is to have your voice actors actually say those lines at full volume. Tell them to actually yell. The only way to make it sound authentic is for it to BE authentic. But when you record those lines, have them back away from the microphone a few feet. That should keep the audio from peaking. Lastly, I'd like to address the song at the end. I can hear what you were going for with that song, and I think it could work, but it needs to be re-recorded. The vocals were very low, the guitar sounded unmixed, and overall, the song sounded rather empty. What I think you should do is set up a metronome to keep tempo, synthesize a drum track, record the guitar with a little more treble and a slightly cleaner distortion, record a bass part to fill the gaps, and then have your singer record her vocals at full volume (she sounded like she was holding back a bit as well). After you've got your parts recorded, mix it so you can hear everything clearly. Then, to test it, put it on a CD and play it in your car. The crappier the speakers, the better. If it sounds halfway decent in the car, it should be okay to put in the flash movie.
Now I realize I've gone on for a while about improvements to make, so let me just say that I really did enjoy this flash. That's the whole reason I'm writing a review this long. I'd like to see you really knock it out of the park with the next episode. I liked the character development, I enjoyed the writing, the animation was overall pretty solid, and you had some good voice actors when they were acting at full volume. On top of that, the singer in the song at the end sounds like she has a wonderful voice. Keep it up, man. Hope to see the second episode real soon.