Selection 3

The final idea would be titled Invasion. This game would be similar to the classic arcade game, Space Invaders, in which the player must stop an alien incursion by destroying the incoming vessels before they are able to land. You gain points for each unit destroyed, and lose points for every one that lands. If too many enemies make it through your defenses, you lose.
Because of the simplicity of the design, and the reward-based system of advancement, the game has an extremely high replay value. Since each level gets progressively as your point score increases, the only limitation is the skill level of the player. However, despite this, such a game concept has been played out over countless generations of the medium, and players would be less receptive of a new entry into the field. Also, like most “classic” games, the repetitive actions become a drain on enjoyment after continuous playing.