I've beaten this 100% a couple of times and really enjoy it for what it is. Obviously it's no masterpiece, but it works for what it is. If you wanted a portable B-K game back in '03 this did the job and did it well.

gruntilda says it's grunting time and takes a feces all over a game boy micro

Completely serviceable. Not amazing, has some issues with the controls and the camera perspective, but for the most part it succeeds at being a 2D interpretation of Banjo-Kazooie. I don't really have too much else to say about it.