Enjoyable
I thought your style was slick looking with the alpha shaded circles however I think if you could find a way to replace those movie clips with more detailed drawings and create an environment which interacts appropriately with all characters then you might have a nice 3.5-4.0, But content is key, so remember to include as many graphics as possible and maybe even make some things to interact with the characters and the background, like a waterfall, and when any circles enter it, the get flushed down, just thinking,
-good job