Nice harmonies. Drums are done well XD
I really like the little interlude type part where you break from the traditional tune. One thing that you did better than the other MAC entries was giving the upbeat christmas tune a videogame feel, with the harmonies and the middle part, it fits better with the 8-bit theme, whereas other people are turning christmas tunes 8-bit without making them right for the videogame vibe. Although it's not as original as rucklo's, there's the interlude and the very slick 8-bit jingle bells melody with a bit of original spin. So, for that, I'll give you a 9/10 and 5/5.
If you get the time, would you mind checking out my MAC entry, I'd really appreciate your opinion.
Cheers. Well done.