I got to around 54 (or was it 43?) before I got confused for the last time and ruined the holiday! Well, actually it was Santa who ruined it in the first place!
Well, nice idea and not as easy as it looks (at least for me). Though it gets repetitive after some time. I think having just, say, 30 presents to sort per level but some different levels with new mechanics instead would spice things up. Of course it wouldn't be endless anymore, then, so maybe not.
The music is alright and all, but only so long. A mute option would be most welcome! I also liked the visuals and the intro, but I found the font hard to read.