No brightness option unfortunately. I may fiddle with it some more, but I think it's roughly where I want it. Might add a very slight glow to Mezz just so he's easier to pick out on screen, but I kind of like being able to blend into the shadows. To be clear though, not all future maps will be this dark.
Oh there's a lot to explore with the lust gauge, have only scratched the surface. Wanted to get the basics set first though. Don't know how much more I'll do with it in this first chapter, but definitely planning to work with it more in future.