Between working on 7800basic, recent MESS updates, and a few side projects, I've been also working on a 7800basic game thats an update to the old classic, Crossfire.
In its current state its a bit rough, with programmer graphics, preliminary sound effects, and just a few essential stats on a plain scoreboard. On the plus side its playable, the difficulty does ramp up, and there's Crossfire fun to be had.
The project is eventually supposed to be a re-imagining of Crossfire, as if Williams had riffed on the concept. I have the basic implementation of hyperspace/shield/smart-bomb pick-up items, though they need more glitz. Given time I'll add humanoids to save, and a few more wrinkles. (which I'll keep close to my chest for now. )