meh
Well, it was alright for a sprite animation. I was looking for more of a point than to just test out fighting animations, but it wasn't blam-worthy.
Some things I would suggest: Voice acting. If you already are using the sprites, you could just use sound bites from the show. More of a reason for South Park to be there. Like maybe a little intro of them getting sucked into their Video Console. And lastly, Cartman. I was waiting for him to come and add a large element of humor to the movie.
So it was ok animation-wise, but work on the plot and voices.