Adding scripts to Shield and Shield Life
Shield protects and is also protected by the Spaceship. Each time the enemy sprite collides into it, Shield will lose one grid of power, displayed by Shield Life.
When the power is gone (all red), Shield is destroyed and the game is over.
Shield Life displays the shield power grid by changing its costumes, each at a power grid damage level. The technique to display damage level with costumes is to match the costume number with the number of hits. Scratch costumes start from one, instead of zero, so costume#1 ...
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