In Scene 28, the camera spends a lot of time looking at the back of Gretel's head, and worse, it blocks Hansel's face while he's talking. Close-up on Hansel while he's talking.
In Scene 34, cut to a close-up of the moon's face when it smiles.
Overall, you need a close-up whenever a particular character is talking.
You're holding too long, and you could make the camera angles more interesting. This is shot like Claymation - which is okay for Claymation but you're doing CG.
Characters are good.
Need other voices besides the narrator.
Sound effects will help immensely.
Characters need "Hair." In fact, I'm assuming you're planning on going back and texturing everything later because the palette is very small.
What age group is this aimed at?
Do at least one glamour shot so we can see what you intend for the final lighting.
GREAT JOB. ONE MAN, ONE COMPUTER, DOING A 30 MINUTE FILM AT HOME!