Hiya!
I have a common color vision deficiency (protanomaly) in which reds basically look like blacks outside of the very center of my gaze. It honestly causes me more problems in other games, but the only real issue that I’ve encountered in No Rest for the Wicked is that healthbars are really hard to read at a glance.
Simply put, an option to change the color of healthbars would do wonders for those of us with protanomaly and protanopia. Please don’t bother with the industry standard “color blindness correction filter” (daltonizer), they very rarely help in any meaningful capacity.