BASE FEATURES: - Controls; keys to move the player left and right - Patrol; Alien moves left and right on its own - Projectile; player can shoot green laser upward - Collision; Alien is destroyed when touched by green laser
STARTER CHALLENGES: - Clones; use cloning to shoot multiple lasers - Enemy projectile; Alien shoots the red laser downward - Damage; player loses health when touched by red laser ADVANCED CHALLENGES: - Clones 2; clone multiple Aliens that all patrol back and forth - Patrol 2; the Aliens do a more complex patrol that takes them steadily closer to the player - Win condition; add a way to win by defeating all Aliens EPIC CHALLENGES: - Enemy projectile 2; multiple cloned Aliens each fire cloned red lasers - Upgrades; player can acquire upgrades to temporarily change the behavior of their laser - Levels; instead of winning, defeating all the Aliens starts a new level with different Aliens or behaviors
