I am currently working on a new version, which is supposed to be sort of like a remake. One of the main additions will of course be more items, but I also do actually plan to make survivors a bit more varied. I'm also planing to add special biomes, one of which could be survivors camp! As to making gamemode disabling nukes, well I could do that easily, but I don't think that would fit the game's theme. There's also no need to make larger areas; maps are big enough, they just need more variety in the land types.
The update should come out December 1st, but due to me being busy irl, I don't know if there will be any delays. But all in all, thanks for the feedback, and for playing!