It is pretty cool on the apple tv. Guess you can pair a wireless controller to graal but your devices battery will be an issue.
You can't use a wireless Bluetooth controller, I actually just recently got a Bluetooth controller to see how it would work for graal and maybe help in a few areas. If your looking for JUST walking. Works great. Perfect even. If you ever wanted to speak. Use sword. Glove.or anything at all besides walking. Won't work. Because apparently graal never finished key mapping stuff to have it set up for controllers