I played the game Collapse. It doesn't take much skill to really play the game but it's amusing nonetheless. You just have to know how to push a button fast, and make sure you can tell which color is which, unless you're color blind or stupid.. hahah ZING!
I think the interface was fine and easy to use. Shockwave is known to have dynamic games, and easy to use interfaces. Navigation on the other hand could be adjusted but that's not a super big deal. It's pretty straight foward anyways.