Pull back the slingshot with the mouse and let go to launch. Use the space bar to switch fruits. The goal is to destroy all of the veggies. (Eggplants are technically fruit, but destroy them anyway)
Here's a list of birds and what fruit they are. Red: Apple Jim, Jake and Jay: Blueberries Chuck: Banana Bomb: Cherry Matilda: Avocado Hal: Pear Terence: Watermelon Bubbles: Orange Stella: Peach Silver: Durian