Use WASD keys to move around. Click or space key to shoot. Use the mouse pointer to turn around. You have to shoot the biggest lemons 15 times until they burst and the second biggest ones 4 times. TIP: Hold Space key or hold down right click on mouse or the touchpad. Have Fun!
Thanks to @griffpatch for the space shooter game tutorial videos: https://www.youtube.com/playlist?list=PLy4zsTUHwGJKFO9kik6tBxkZnmujKIsWB
