Submission has been made to the jam. Sometime over the course of voting I'm going to write a comprehensive post mortem of development. I'm happy with the amount I learned about libGDX and will be using it in future, but I'm not particularly pleased with how I didn't come into development with a strong design plan in mind. The result has been a mess of code that became more and more difficult to expand and modify as the jam enter "crunch time". I did however get to make a lot of assets using new tool I acquired over December and I'm very pleased with how my skills have developed.
All told, great learning experience and I'm happy to be getting a new tool to use for development. Maybe I'll be lucky and get a T-shirt. :)