A simply coded example of an Object Oriented space invader type game.
Standard Invader (1 hit point)
Boss Invader (2 hit points)
UFO Invader (10 hit points)
Avoid enemy bombs
Pick up health packs
Weapon Upgrades
Score Bonus
Move with the Left / Right arrow keys, Space to fire
First Strike - get a kill with the first shot
Killstreak - get 10 kills in a row
Roswell - shoot down the UFO while other enemies still remain