Sorry if everyone already knows this but one of my favorite games on Android "Zombie Gunship" works perfectly on Android TV.
I'm using the Nvidia Shield TV and it has full contoller support and shows up in the leanback launcher. The only thing is you have to install it from the web. It doesn't show up in Google Play on the Shield.
Killing zombies just got a lot easier and enjoyable on the big screen. I hope this helped.
Write the developer, and ask them to officially list it for Android TV. Sounds like an easy enough job for them, and then it will be easier for TV users to find and install