I played it, the first time, for about 6 or 7 hours straight. It was fun working with people.
The world is a rough model, but fun to explore. The F1 Help is not up to date, that created some confusion (it wasn't until about hour 6 that we figured out how to use canteens/fire). Changing weapons, or hats, created multiple images of the items (old graphic does not clear). Scrap metal was really hard to find. Can't tell if the plane drops anything (the fire/smoke crates don't seem to do anything). Are machetes useful for anything? Backpacks are too small, or some more options (upgrades?) for carrying stuff would be nice. Have never found a bow, but did find 2 arrows. But I didn't get stuck anywhere and I didn't fall through the ground anyplace. Do items disappear after a while, or do they fall through the ground? ... That's all I can remember.
But it was fun. I played with a group of people (up to 4 or 5 others, the groups fluctuated) for a very long time (none of us really knew what we were doing), We worked at finding things that others needed, helping people figure out where they were on the map, helped people get the basics for survival, killed PKers, but often it was tricky to explore because the places left alone for a long time would pile-up spawned zombies (deer pyramids were funny). Once a town was taken over, keeping the zeds down was easy.
More but slower zeds would work -- or same speed zeds but more spaced-out would work too. Otherwise it was a really fun several hours. We really got into it. I really do hope you're inspired to keep expanding on it.
(Nice C-64.)