I got the Nexus Player last week. Games didn't figure in my purchase decision, but looks like there's decent selection of casual games for Android TV. I've tried Riptide GP2, Leo's Fortune so far, and they are fun for some casual time-pass.
Do you play any games on your Android TV? If so, which games?
I have the Shield TV, wasn't sure if I'd game much at all on it because I'm into PC gaming but the thing is a monster when it comes to gaming. So far I've been playing the Lego Lord of the Rings game with my wife, and messing around in pixeljunk shooter and monsters, all streaming through Geforce Now. Borderlands is pretty good too though the controller and network latency make it a little frustrating.
Other than that, goat simulator and the Telltale games (walking dead and Tales of the Borderlands) are also fun. And Loco Roco and Wipeout Pulse emulated through PPSSPP