I've just about finished up the first draft of a piece of work I've put a good deal of love into. It's genre fiction (paranormal/supernatural horror/urban fantasy/whatever they're calling it this week), and I want to go back and put in a couple scenes as well as apply a LOT of polish, but it's only about 20,000 words - too long and complex (plotwise) for a short story, but far too short for a novel.
I have sequel ideas - should I dub this "part one" and write two more parts? Or would it be better to leave it as a novella?