Back in March, Google announced this:
http://www.engadget.com/2015/03/02/android-tv-uses-phones-as-gamepads/
But as far as I can tell, there is no easy way to tell if a game currently supports your phone as a controller. Is there something I can look for or a list of games that support this?
Jackbox.tv games use a web browser as a 'controller'. Great party games: I've definitely got my money's worth of laughs from Jackbox Party Pack 2 ( https://play.google.com/store/apps/details?id=com.jackboxgames.JBPP2Loader )
Edit: +1 for Bomb Squad. Awesome game (but best with actual controllers)