If you're into stuff like this then it's a rather good game. But there are a few things I need to point out.
1. You should fix the fact that if a gift touches another even by the side, it just drops down. I do that because I want to put them down neatly.
2. The song should better fit the theme. It's christmas so it should have some remixed version of a christmas song.
3. The gameplay gets boring very fast. You have to add something to keep the person going. Some kind of story mode or something else other than just leaderboards where the first people will hack their way there probably.
4. Also the game is rather dull. It would be nice to add some effects.
5. I'm not saying this genre of games doesn't have an audience, but I think it's not that big. I suggest going into something which has a larger audience after a few test tries at flash games.
Other than that as I said, the physics are good and the game style fits it's genre. I'm not into that and there's a lot to improve of course. That's why you get 3 stars.