It works with Shield remote, per a post on Google+. No leanback banner support.
This game is awesome. My son and I were playing it a lot tonight. If he completes the first chapter we are going to get the season pass.
I haven't tested how well it works on Android TV yet (I'm at work), but I've been able to install it on my Shield TV from the Google Play website.
It's a phone version though. Streaming the pc version is much better.
Local co-op?
Game controller support?