You can change the background and the font color in the menu. There's also a volume slider in the right sidebar...
It might help if that was labelled. Just a random slider with no indication of what it does isn't exactly good UI.
Also, I got around to checking out 0.4.1, so here's my thoughts:
Bailey: I'm waiting for the option to skip the gloryhole stuff. It takes several in-game
months to go through all that, and I really can't be bothered to do so again when I don't want to do it anyway.
Riley: Disappointingly, all the new events seem to be the same boring material we got last time. It's sad how she's gone from being such a fun character early on to
easily my least favourite with this recent direction she's taken.
Sasha: She is behaving very strangely indeed, there's not all that much explicit happening but it looks like her story might be heading towards the MC helping to break her. That could be
very fun, seeing it all from a different perspective. Also tying her up was fun and has a very nice picture of her.
Lexi: She still seems to be extremely confused about her obvious attraction to MC. She's hot as hell, and when the dam breaks it should be amazing.