I've had it generating working python code for entire text-adventure games based on unlikely novels (Thomas Hardy's "The Trumpet Major" eg).
If you ask it to start adding in NPCs and fighting mechanics it will start doing that, too. I built a small "Canticle for Liebowitz"-themed text adventure in pieces- first asking it to add NPCs, then add a fighting mechanic, then add weapons to be wielded, then for the weapons to have damage ratings that matter. All I had to do was update the functions that it wanted to change, and add a few "global" declarations.
If you ask it to start adding in NPCs and fighting mechanics it will start doing that, too. I built a small "Canticle for Liebowitz"-themed text adventure in pieces- first asking it to add NPCs, then add a fighting mechanic, then add weapons to be wielded, then for the weapons to have damage ratings that matter. All I had to do was update the functions that it wanted to change, and add a few "global" declarations.