Hi, there are quite a few bugfixes, new backgrounds (I love the shuttle) and some new content. There is also some new content that you should see after the "Following scene(s) are under construction."
We had to rewrite the story controller a while back, and this unfortunately won't allow you to progress with your old save. I hate introducing save breaking features, but unfortunately it's something that has to happen once in a while. (Ironically, this save breaking feature means we can add much more new content, without breaking future saves when it comes to adding to the story!)
Edit: Thanks to EVERYONE in the community who jumped in and helped resolve the issue in the comments below! <3