Press space to bonk the gigas. Every bonk on the gigas increases the local score by 5. When the local score reaches 50, the high score increases by 1 and the local score resets to 0 and changes the timer back to 120 (2 minutes). Once the high score reaches to 50, you win the game!
Thanks to the youtube tutorial given by AlSweigart in Invent with Scratch 2.0 Screencast. The title: Whack-A-Cat