Simplistic. Very simplistic.
It's a very charming game with nice colours and good animations. The music does its job, but nothing more, really.
The gameplay is very simplistic, and all that really separates the characters are the animations. Otherwise, the attacks are all identical. But still, it's entertaining.
The characters are surprisingly interesting, but the cheezy voice acting is horrible. But hey, I got a good laugh out of them.
In summary, this is basically a beat em' up among them all. It's got a fine manga/anime-feeling to it, but it doesn't reach all the way.