The controls are straightforward. Whistling moves the character forward, clapping acts as the “Use” key, two different grunts turn you left and right and as for shooting? “Pew pew”, of course!
Sadly, if you want to play it, there’s no demo or instructions, though if you’re dedicated enough I can imagine it’s possible to pull together the hardware and software yourself.
Somehow, I don’t see this method of game-playing catching on, outside of some specific circumstances. I for one would be afraid of hyperventilating or scaring small children during the more tense and action-heavy sections of your typical shooter.