Ninjar (Python, with PyGame)
Our Ninja exists in perfect Ninja tranquility, upon a finite plane of austere Zen contemplation. Only the incessant, infinite flights of confetti filled combustible birds mar this ultimate Ninja existence. Armed only with his flying kick of compassion, our Ninja may attempt to rid the sky of these airborne abominations, but ultimately must come to realise that true Zen is found only by acting on the world within.
(Unoptimised PyGame example)
Download Ninjar (requires Python, Pygame)