Hi! I saw you're after pixel art, so this may not be what you need - but in case your visual direction is still open, I work in a comic/graphic-novel style and happen to have a Soviet-era character set already built, plus matching environments.
To be upfront: I work AI-assisted and refine from there - that's what lets me put together large, style-consistent sets quickly. Totally understand if that's not for you.
Portfolio: https://www.artstation.com/assetsmithy
Either way, good luck with the release - sounds like a great premise.