The X_SCREEN seems to be only used for the title and date labels. Y_SCREEN isn't used at all, at least not in that file (and also nowhere else, as far as I can tell). This is probably leftover code from earlier implementations.Why does the game ignore the self.X_SCREEN and self.Y_SCREEN settings?
To change the location of the the window, try replacing "screen.centerX(0)" and "screen.centerY(0)" in line 125:
screen.setDimensions(screen.centerX(0), screen.centerY(0), self.W_SCREEN, self.H_SCREEN)