Extremely fun, but unfortunately, extremely difficult!
However, as you get to the final stages, I found myself losing Prinnies left and right. The boss fights are extremely difficult to put things mildly. I, myself, am a casual gamer. I love to play a game which, if I made a mistake, I can re-do a few more times to get it right. With Prinny, you will find yourself re-doing a boss fight sometimes close to a hundred times!
The game is indeed very challenging. But if it's just too difficult and you find yourself constantly repeating a stage or a boss fight, then it ends up just becoming a waste of time.
This game is best left for wanna be professional platform gamers.