On my opinion you shouldn't play games on your Android Gear for 2 Reasons.
Reason 1: Playing on a wearable device will often make it hard for you to consentrate with your game because of the small screen.
Reason 2: Playing on the Android Gear will often make your eyes sore and make your eyes see harder in the dark.
On my opinion you should just use wearable devices as they are, and not to play digital games on them.