Originally Posted by Asphyx
Nothing too elaborate considering the Delay inherent with the streaming.
There may be something a little better than Tic Tac Toe (available) but it would mostly be turn based stuff as anything that requires Twitch and React will not play well.
I could see something akin to the "overview" screen that some racing games do, but as Asphyx says, the inherent delay will prevent anything timing-based from relying on both device and CC screens simultaneously.
Leaderboard, instant replay, map would be possible though.
A Battleship type game would work, as would most hide-your-hand card games, Vegas type gambling games, and trivia games.
Lots of possibilities, but ultimately it's up to the developer and how much Chromecast ties into the core gameplay. The risk is too much tie-in will limit the game's market to Chromecast owners specifically, while not enough tie-in will make Chromecast just a cute toy.
Now if someone made a game that ran on
the Chromecast itself... that would be interesting, as it would obviously require
a Chromecast to play. Even higher risk, but better possibility of sync between players.