Space Age has four levels; for each level, a special enemy sprite is responsible for the attack and they are as follows:
Level one: Rock
Level two: Monster
Level three: Robot
Level four: Mother Ship
In the starter project, there are only two enemy sprites: Rock and Mother Ship. Both the Rock and Mother Ship have complete scripts and are ready to participate in the game. We will copy Rock to create Monster and Robot, and then tweak their local variables to increase the difficulty.
The Rock sprite attacks by crashing and firing ammo. When created as a clone, it continues to fall down at a random speed and randomly fires rounds. The speed of falling as well as the frequency of firing the ammo are configured through min_speed, max_speed, and shoot_random_wait.
Before duplicating Rock to create new sprites, first test the Rock sprite by playing the game. Click on the green flag, and hit the Start button to start playing. If all is well, you should see the Level...