Game is ok, but only in the short term.
This game was fun for my son (6) and I at first. After a short time, it is too repetitive. With no multi-player, the game just seems to be the same over and over with different backgrounds. The controls are easy enough for a five year old with fighting themes one would think would be for a ten year old. The fighting takes no effort, just shake the controller and jump a few times and you will win on the main fighting scenes. The mission bosses are tougher, but you get enough chances that most kids can get through it.
I think they missed the mark a bit. If they had intended to make the game for five year olds, then do so. If you want to challenge the tweens, then give them a challenge and let them work through it.