Hi! This sounds like a fun project to work on, I'm happy to adapt into any style though I've not done any top-down pixels before. If you'd like an example of what I could do in that style drop me an email. Do you have designs for any of the characters yet? I am also passionate about character and creature design!
Portfolio: http://sidneyflavell.com/
Contact: sidneyflavell-art@outlook.com