As promised, here is my review... This is a very quality short and it really shows you have talent in animation, from the use of well placed camera angles to the overall smooth flow of action.
The story and premise itself was good. It was a fun and new take on the tried and true "guy-X saves Christmas" storyline with some good pop culture (the grinch) and social references mixed in.
As you mentioned, the voice acting could use work, but all in all it wasn't terrible. The acting itself was actually alright, but moreso the recording quality leaves something to be desired. This did prove to be a factor, but not so much so that it ruined the overall short.
As far as artwork go, you show a good knowledge of perspective, proportion, and flow as well as excelent color and shading ability. I personally am not a fan of using such thin line art, but that may be in part because the thinner your line the more glaring any minor misstep in your art will show.
Again, this was a great short, and it showed that you are definitely a person to keep an eye on for more content in the future.