I've now completed all of the levels. They were like delicious nuts: sometimes hard to crack but the good insides always paid off. I solved them all fairly easily, except 'Look Who Is Waiting up There'. I was stuck on that one for a good while but I did get it in the end.
Every time I tried something I was always one skill short somewhere else. The skill distribution is great.
I don't have a lot of experience with jumper puzzles, so that's why this gave me so much trouble.
I really liked every level in this pack but some "honorable mentions" should be: 'Climb to Christmas', 'Docked at the North Pole', 'Stockpile of Presents' and of course 'Look Who Is Waiting up There'.