How to play Shape Invaiders

About Shape Invaders, from BoardGameGeek:

Shape Invaders is a retro-themed dexterity game for two players who are trying to be the last mothership standing. Each player has three types of piece: Mothership, Shields and Fighters. You can flick your Mothership and Fighters at the opponent pieces to knock them off the table. Any Fighters or Shields knocked off the table are out and cannot be used again. If your Mothership is knocked off you can swap it for a Shield piece on the table for an extra life, but if you're out of Shields your Mothership is lost and your opponent wins the game!