If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
You're Bob, a young spaceman who was captured by the evil aliens and taken away to a distant planet! The aliens plan to perform painful experiments on you, so the only option left to survive, is to run away from the alien base.
Left / Right Arrow Keys - Move.
Up / Down Arrow Keys - Climb Up / Down.
Spacebar - Jump.