There's now an unofficial version of Minecraft that's running on a Smartwatch. Why, you ask? Well, why not?
Below is a video of YouTube user Corbin Davenport succefully running Minecraft: Pocket Edition, which is the Android version of the game, on a Samsung Gear Live Smartwatch. The Smartwatch is running an Android OS, making it a prefect candidate. The game was not modified in any way, according to him.
So, if you're not bothered with the extremely small screen real estate, maybe you'd consider playing Doom?