I tend to use comments a lot and while I love the theme overall, the color choosen for comments makes them almost unreadable in either the light or dark theme.
Changed color used for comments for all variants.
The previously chosen color could not even be discerned from the background color.
I wasn't even aware markdown (and Mou) supported comments until you pointed this out. That probably helps explain the terrible color choice. :)
Thanks for reporting this issue!