Unravel two is all about yarny falling off a ship and finding another yarny. They become friends, and red yarny helps blue yarny find his memories... i think. I'm not very good with environmental storytelling, so i am not too sure about what the story is here.
The game... never had the biggest difficulty spike compared to the first game. In my opinion, the first game is too hard, and the second game is a little bit too easy.
Still a good game, just not as memorable as the first.