For those of you too young to remember Game Boys were the handheld console of choice for maddeningly addictive games. The Colour version was like a revelation. Yes, we use’d to play games in black and white (well kind of shades of grey really).
The emulator used is VGB and the controller is made by Moga which is supported out of the box by Android Wear. There’s a guide to getting Doom working on his YouTube channel. Great stuff.