An interesting and under appreciated concept, I admit. I've always had a soft spot for area control games, but this project is a bit under developed. I would suggest implementing some extra features such as enemies, more interesting background music, etc. Basically, it needs expansion before I can fully rate it.
Don't get me wrong, it's a lovely game to start with. The characters and background elements are all nicely done, and the coloring is interesting as well, but it just needs a little extra spice. As it stands, you got a few plays out of me, but it gets dull after a while. It needs that added flavor to give it some special replayability.
Aside from the points made above, well done. It was an enjoyable little game while I played it, and it took a silly concept and turned it into a somewhat interesting flash. Keep up your work!