NG Alpha.
This belongs on NewGrounds Alpha; not the Flash Portal. Only submit finished products to the Flash Portal. That said, the story's fairly well set up, so far. I have not watched previous episodes, so I can't appreciate it like others, but I can tell it's good.
The problem I have is with your sprites. When floating, their feet look like they're standing on something. Also, the music is awfully quiet while the sounds are fairly loud.