Hello, I'm Lorena, a character artist from Spain ^^
I specialize in character design but I also have some examples of backgrounds in my portfolio: https://lorenyan-art.carrd.co/
I don't think I have that old-anime artstyle that you are looking for, but maybe I could be the background artist? I am versatile in other styles.
I love drawing emo/goth girls and I'm a bit nostalgic for the 2010's. I'm also a fan of games with many endings, i think you have a cool game.