Thank you for your feedback! It can be fairly easy ported to WP8. I'm saying that because WP8 doesn't have full support for D2D, so there might be some roadblocks, but DirectXTK can be quite of some help in this case.
@Roudoudou:Thank you! The game is this big code-wise because of many "raw" feature implementations, such as the rendering stack. For the most part, you can reuse game components that are included in FallFury in much smaller projects.