New Worlds Await!

Basically, I made it so your ship is blocked from going south by an ice wall, but you can fly over the ice wall with your dragon.  The dragon however, can only fly over during the winter (when the sun would be in the southern hemisphere primarily). When the ice is sufficiently melted, you can only return the way you came during a season that isn't winter (that new world has its own sun, which would be in the southern hemisphere). These other worlds are basically parallel dimensions, so I was able to reuse towns. But I will probably want to change people or dialogue eventually.  I also did a few small edits to make things like seasons and lunar cycles a but better.