If you were interested in the brush they use in the video, they posted this on their Facebook page about it.
Travis Ho commented on Autumn Dynasty's Wall post.
Travis wrote: "You don't actually need a brush to play the game (fingers work great too!
), but we're using a capacitative brush in the video-- it's the nomad brush from http://www.nomadbrush.com/
and worth checking out if you need a nice stylus alternative!"