Hi! Yes, of course, you can showcase your work for the game in your portfolio. As for that, I won’t have strict rules — just one thing: I’d prefer if my characters or related designs weren’t sold or reused for other people or projects. That would feel a bit strange, heh. Everything else doesn’t really concern me, especially since I’m not even paying for this.
I also have a limited amount of time to dedicate to this game since it’s not my main activity, so the pace will be quite relaxed