Bruh theres like 5 zombie survival rpgmaker games with this exact artstyle
Is this the same dev dropping projects or just everyone commissioning the same artist
I know I'm doing a bad thing by humoring somebody that can't even be arsed to do a little research and therefore encouraging stupidity but I'll do it anyway:
There's 3 games about zombie survival with this artstyle:
First was Nergal, who made 'A Zombie's Life' and comissioned ScarlettAnn. That game was abandoned for a while due to personal issues on the Devs end, they dropped a few other projects and, several years later, they came back and 'finished' A Zombie's Life. It is still incredibly buggy and doesn't work properly.
In the meantime, Siren thought the idea had merit and, since Nergal had dissapeared off the face of the earth, hired the same artist for a comparable game. This game was zombie's Retreat. Which they finished. This was before Nergal came back but the finishing happened slightly after Nergal came back.
Siren eventually finished Zombie's Retreat, completely and then started Zombie's Retreat 2. You might have figured this was the continuation of a previous game if you had bothered to open your eyes and read the title of the thread or the description of the game in the opening credits instead of immediately typing out every thought to come to the fore of your head. (Don't be offended, you cleary didn't put a lot of thought into this.)
As far as I know, there aren't any other Zombie survival games with ScarlettAnn as the artist beside these three, so I have no idea where you're getting that 5 number. Though ScarlettAnn has made art for other games, they're not Zombie games as far as I know. It might just be that you saw Zombie's retreat getting updates and your brain has issues with the concept of iterative updates and thought those were all different games?
TL;DR:
3 games with a similar artstyle, same artist: ScarletAnn
Nergal is the dev dropping projects:a zombie's Life. Which was dropped by someone else before Nergal picked it up.
Siren made ZR 1, finished it and you're now in the thread of a game by Siren with the same name with a 2 after it.
Hopefully that answers your question. (But honestly, this has been explained a few times over the course the thread as well, so just doing a search (upper right) would have given you this info too)