Story: You're a crazy guy who hates the world. Today you're trying to secretly subvert them by throwing a snowball to the street. But try to attack only healthy people, as destroying an ambulance somehow hurts your conscience. Be aware of subway trains and underground guards who're protecting the sewer for some reason. Maybe they're onto something too. The game itself is super annoying, as it's way hard and there's no game over screen. Deal with it.
EDIT: Added a more playable postcompo version.