I am having a very hard time distinguishing between tiles that are unflagged, flagged, or opened. The only tiles that are legible are the numbered tiles, and this is the only theme (out of three) that does this. The other themes color the number rather than the tile, or just makes all the numbers black. Question mark tiles stand out really well with a black icon, though.
But seriously. What the hell is this??? Why would you do this? Did you bother at all with usability testing?