Yes, Minecraft can be played on a Smartwatch
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?
Thanks, KotakuUK.