If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
You are an evil yeti in this game and the object of the game is to devote yourself by throwing snowballs to the innocent skiers and beat them.
Spacebar - Throw.
Down Arrow Key - Jump Down / Search for skiiers.
Up Arrow Key - Climb.
LEft Arrow Key - Enter the cave.