I'm not usually a big fan of zombies (except in a Voodoo context) but I could revise that opinion for 17th century plague-ridden zombies. James Desborough's Wightchester: Prison City of the Damned starts with the closed-up streets of the Great Plague and runs with that to its sanity-rending beyond-all-logic conclusion.
Wightchester is a low-fantasy horror campaign that sounds perfect for gamers who play to discover the story. As the Indiegogo description explains, this is "a setting where blades and gunpowder are more important than magic, and where the magic that does exist demands a price. Not a hex crawl, or a conventional adventure, but a free-roaming setting where you can decide what you want to do. Do you want to try and escape? Do you want to create a fortified place to live within the prison? Do you want to clear the entire city of the undead and earn your release? Good luck with any of those."
You've got till the end of September to back it. And after the last eighteen months of real life, what could be more cathartic?