I like the narrative aspect
I found the fact that nearly the whole movie was spurted out of Kirby's mind amusing in itself. Specially at the end with the Joanna's stated opinion of the story.
It was all fairly amusing, but as a person unfamiliar with the series, some stuff may have not had its full effect. Hence, it got only 1 chuckle from me. (the ending)
The parody of stories written by children could have been taken further, with some unnecessary detail (narrated extremely quickly of course) and maybe a bit more randomness.
Also, maybe a sort of crayon effect may have been a nice stylistic choice for Kirby's story.
Still, fairly amusing.