If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
The beach is the perfect place for collecting seashells...to the head.
Hurl shells at your opponent to knock him out. Click and hold on your character to build up power, then release to throw the shell. Adjust your power to the wind with the little green meter (center top of the screen). Click on the icons under your health bar to use the power-ups—but don't miss, because you can only use them once