Again, American McGee's Grimm: The Pied Piper
is pretty simple in the control department. The series doesn't usually require more than just running around in order to spread darkness. This gets your Dark-O-Meter up as you've spread more and more. Since the good people inhabiting the world will be constantly cleaning it up, you have a butt-stomp move available that will stop them for a while so you can build up your meter again. Really, this is about it: running around and jumping. The controls are simple enough that you can play the entire game without the use of a mouse by using the arrow and the W, A, S, and D keys.
As mentioned in the difficulty section, the slippery mechanics of the game really show in this episode. There is one area where you have to jump from moving gear to moving gear. You seem to slide around in a way that you're not supposed to, and when you're spinning around trying to figure this out as well as jump to the next gear, it's just a little frustrating and it doesn't feel right at all.
As charming as these games could have been, it's difficult to recommend them. You can try it out if you're quick enough, however. GameTap offers new installments of the Grimm series for free within the first day of launch. See www.gametap.com/grimm for details.