Good visuals. Not too sure about the character models, especially for the tiny protags, but I suppose they're passable. Sounds works, although the 'voicing' is part of what I found this lacking in. This is a children's cartoon. I expect it's comedic to a child. Not so much to me, so I've to judge it on that.
Half a star extra for the addition of a subtle Wilhelm scream. That's something a child couldn't appreciate, but I can, so expression of that appreciation is due.
Conversely, if I were to score this for its entertainment value to a child, I'd give it 4.5 starelles.