Comics writer Marv Wolfman observed that in elementary school he could tell which kids read comic books, because they were the only ones who knew the word "invulnerable."
Mutant Year Zero leans more toward realistic-gritty post-holocaust, with a certain leavening of mutation and robotics, rather than a Gamma World-style gonzo approach. This Reddit r/rpg thread, "Mutant Year Zero," goes into this point in more detail.
I'm all for mild jocularity, when warranted, but we should avoid sowing wilful confusion. The modules in the Fifty-Dungeon Megabundle are d20 System adventures published 2005-2007 by Goodman Games for D&D 3.5.
Have you checked this list against Lowell Francis's six-part "History of Licensed RPGs" on The Gauntlet Blog and on Age of Ravens? Lowell has also compiled useful lists of superhero, horror, steampunk, post-apocalyptic, and universal RPGs.
At the Bundle of Holding site I've just launched Shadowrun Sixth World Essentials, featuring the current rulebook and major supplements. And there's more Sixth World ahead.
Although none of the titles in the HOSTILE Bundle of Holding answer these specific questions, you may still be interested in filling out the product line.
That's correct -- all eight sourcebooks in Conan Careers are new to the Bundle of Holding. For those who purchased the December 2020 "Conan by Modiphius" offer from Humble Bundle (which, as I always have to say, doesn't own and isn't related to the Bundle of Holding), there's a breakdown of the...
In case anyone follows this thread who hasn't already read Part-Time Gods 2E, at my Bundle of Holding site I've just launched a Part-Time Gods Quick Deal with the whole 2E line for US$9.95. The offer runs for just five days through this Monday, April 4.