If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Skelter is a lovely dog hiding within a bubble, which will sustain some oxygen in it to prevent him from drown just for a while. Walk around collecting all the balls, yet the final purpose is to approach to the exit. However you have to take a long way there, for there is no direct way leading to the destination.
Left Right Arrow Keys - Move.
Spacebar - Jump.