If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
It's hot out. Stop your be loved ice cream from melting in the hot sun by staying beneath the clouds. Watch out for enemies, they'll try and hurt you! Hurt them back by jumping on them. To progress further, listen to Erik and recover his items for the far end of the beach.
Up Arrow Key - Jump.
Left / Right Arrow Keys - Move.