Playing through this game which roughly covers 10 hours in length isn't enough because there is just so much to do. Constantly replaying stages to beat bosses to get powerful weapons or starting over from square 1 (Yes, that means a new game people) are just some of stuff you can do after beating the final boss once. The best part is, there's a really good chance you wouldn't think twice of doing things that can take you 5 hours or so to accomplish.
Patapon is hands down one of the top 10 best psp games of all time. If it doesn't have you chanting during class hours, in the shower, or among friends, then you would be better off giving this game to someone else.