What a great work! I gave only a fast look at it. A question: This tool allows even asset clearing and reloading (for swapping graphics, for multilevels games with disk loading, for example) or, more incredibly, loading new code into memory?
No at the moment it allows only to load and run another .prg file (with some memory area preserved to store for example lifes, scores, etc) from the disk, but maybe in the future I will try to support cartridges in order to have more memory available.