I'm working with the memory match game as well. Having a hard time getting the game to size to my phone. The screen is showing to much of the layout. Note of the sizing seem to help using the Fullscreen in Browser option. However just about every other sample game works.
1. The cards are too big
or the cards are two small for the mobile device.
Trying to use modify the HTML 5, viewport <meta> tag does not work not much control.. using the Intel XDK or Dreamweaver CC. seems to me if I trying doing a web app I could size it to fix my mobile device.