Glad to hear you're enjoying it!
Your request is definitely something I want to do at some point. I can imagine it might make some of the UI features/effects look strange, and due to how it's implemented would affect more than text alone, but one of the goals is to make the game more accessible to players with various types of color blindness.
Read more about my potential approaches
here. You can see a test there as well
Edit: By the way, try out the
new fonts coming in the next version since they will also help those of you having trouble with readability of the defaults.