"Stardew Valley" was just released on Play store ( https://play.google.com/store/apps/details?id=com.chucklefish.stardewvalley&hl=en_US ). It's a modern take on "Harvest Moon" series (farming simulation plus some RPG elements). While not officially supported on Android TV, it actually works well on both Shield TV and Mi Box. It does not have a shortcut on leanback launcher when sideloaded. You can either use Sideload Launcher or create one ( http://atvlauncher.trekgonewild.de/ ). It's playable with remote & Mouse Toggle app, but much better with keyboard & mouse. It doesn't seem to support controller at this point.

Some dialogs on Mi Box have minor graphical glitches (color is inverted), but still readable.