Those sound like worthy additions. And that makes sense . . . I'm not sure honestly, and now that I think about it focusing on more features should triumph the art style. I'd leave that up to you as I don't particularly feel qualified to answer that, but I would say focus on the features first and then adjust the lighting. If it is easy to do you could add an option(s) in the menu, but don't let it prematurely capsize your project.