Script wasn't too retarded.
In fact, I liked it. The characters seemed to be neither too flat nor too exaggerated in their personalities. My favorite aspect of their portrayal is Frosty's transition from comfortable to frantic. The breaking of his leg was really the inciting moment at which the chaos and hilarity really began to erupt. The crawling added a nice touch, especially when you consider that a simple visit to the little boy's house turns into a fight for survival. I especially loved how Frosty tackled the little kid, cursing at him no less, to escape when just a few seconds ago, they were enjoying hot cocoa.
The artwork was very nice. I love how you combine realistic, hi-detail backgrounds with cartoonish characters. It's a great style and you never seem to make them clash. I even noticed that you fudged in loads of highlights and lighting effects to put those finishing touches on your scenes. It's little things like this that, when combined, really give off a great effect.
The dialogue was simple and short, which goes along with the plot, making everything dramatic, but quick-paced as well. The music, too, also helped fit the mood and direction of the toon as it jumped from plot twist to havoc. Having my headphones' volume all the way up, I was absolutely startled when I saw Frosty make his final appearance. Loved that the cartoon ended right there without being resolved.
This definitely has replay value, so I think I'll watch it for a fourth time.