I liked the music in the background a lot, and the idea was simple, but it made me laugh.
A note code-wise: I recommend that when a user clicks on an object and drags it onto the snowman, it creates an empty movie clip, attaches that symbol, and moves it over. That way, you don't limit your users to just one machine gun. ;) Also, it means that users can choose the order in which objects stack on the snowman, so (for instance) I can put his left arm in front of his scarf.
Oh, and I noticed the the left red glove didn't fit perfectly on one of the left arms. But that's just me. :D