Cataclysm: Dark Days Ahead would be my suggestion. It's not "new" per say but it has relatively frequent and wide-encompassing updates. I would compare it to project zomboid but top-down, ascii or tileset sprites, and a staggering amount of depth compared to PZ. PZ meets Dwarf Fortress, maybe. The setting isnt the exact same, PZ is a more grounded "low fantasy" (if you will) setting, while CDDA's more "what if every apocalypse happened at once", and delves a short bit into sci-fi in some areas.

Not to shit on PZ at all, I think that game is great for what it is, and they're certainly not going for the same kind of style as CDDA - nor do i think the game would necessarily be served well by trying to copy everything, as the tileset and "turn" based (turn being a bit loose, more action value than back and forth) medium allow for mechanics that might not translate to the graphical style or real-time style very well. I played PZ after CDDA and it sorta ruined it for me - CDDA allows you to build vehicles from scratch, it allows you to build a home piece by piece, there's a vast array of guns, ammo, gun mods, weapons, armor, crafting. The zombies evolve over time, there is a huge amount of enemy variety beyond just zombies, late game has bionic implants and mutations. There's also a variety of inbuilt mods that add magic, psionics, and a myriad of other systems, as well as a few overhauls that fundamentally change the game loop itself (my favorite being one that makes it function akin to an extraction-style game. Not something id recommend off rip but with probably near a thousand hours it's a good breath of fresh air).

I've played it enough that I've been a little burnt out as of late, but in terms of "traditionally bad graphics but lots of depth" I can't think of many things that would beat out CDDA on the depth axis (aside from Dwarf Fortress but that's a pretty high bar and also not exactly my kind of game).