If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Its probably not the best news for all inhabitants of Camp Happy.. the visitor has arrived! Help the hungry murderous wurm to slaughter everything and everyone. Eat other animals to grow and take their abilities to swim or fly.. Eat everything in your path in search for a human meal.
W,A,S,D / Arrow Keys - Move.
CTRL / Spacebar - Eat.