TBH...I'm still not feeling the white text on the coloured buttons. I can barely see what the light green and yellow buttons say. Needs contrast so the words are clearly visible. Have you tried it with dark text? If you don't like full black (my preference) perhaps a charcoal (not quite black). For menus and buttons you need contrast. If you don't want to go with dark text perhaps applying a slight drop shadow or stroke (thin outline) around the text might help? I don't have an Android so can't test it though.