There are a number of games that may have limited support for TVs. Many, like Minecraft: Pocket Edition, may support gamepads in some circumstances. Although it may require a touchscreen in some places, in general it functions well without it. The other requirement for games on Android TV is a banner to appear in the launcher.
In the case of SHADOWGUN: DeadZone, it had supported gamepads for some time, just because it was something that mobile users wanted. Thanks to the enthusiasm of the Android TV community, the game now has added a banner and officially supports Android TV. (Being made in Unity helps too.
SHADOWGUN: DeadZone is a relatively new mobile game from MADFINGER Games. It is a multiplayer shooter game that has pretty advanced graphics considering it was designed for mobile phones.
The game is free to download on Google Play with IAP.