If you put your banner only in res/drawable it would be considered mdpi and will look blurry on most TVs (1080p TVs are xhdpi). So I'd recommend having xhdpi resource in addition to any other. Lack of res/drawable won't affect much since xhdpi would be preferred anyway by Launcher.
This is really an issue that needs fixing. Android TV is just an Android device that doesn't rely on touch, and Minecraft already supports Bluetooth controllers.
Besides the banner (which needs to be paced in res/drawable-xhdpi, not in res/drawable) and LeanbackLauncher intent the touch screen feature needs to be declared as "false" and leanback feature also needs to be declared. In addition to that the "opt into distribution on Android TV" check box needs to be marked in the Play Store developer console.
More details here:
https://developer.android.com/training/tv/start/start.html
https://developer.android.com/distribute/best-practices/launch/distribute-tv
Can this be please reopened? The issue still persists.