That would be a cool option or something to possible make the text bolder so it's more visible compared to say lighter backgrounds which might make the text harder to see?
They usually work fine but the biggest issue is naturally text size and not being able to see the images behind it as android devices are smaller than a PC so it could be harder to read the text.
Will it ever get updated as GBA still sounds horrible, bigger screen would be a cool feature and other console support if possible? Not saying GC level as it would require lots of time to make it work but surely others could work with tweaks to the code.