Almost perfect
I love this one just as much as I love the 2001 version. There are some obvious new additions that work very well, like being able to leap forward farther, falling off of bridges, and being able to kill more innocent creatures before losing the game. I smash some of them just for the fun of it, since I have so many to spare.
I can't imagine how awful this game must have been with Blink-182 music. Great choice to remove it and add a good Christmas song. It would have totally ruined this game to have crappy punk music in it. It also totally ruins all of your other games when you add stupid childish or crappy music in it, which is mostly why I usually don't enjoy them. But this one is great.
I think I like Sack Smash 2001 more, it just has a better feel to it. I also like the skin color of the sack smasher in the previous version better, in this one he looks way too much like a gross naked human dude, which makes it less fun.
I REALLY hope you make a 2005 version of this series. The two Sack Smash games are on my favorites list because they are very fun, and a third version would be very welcome!