Introduction
Earth Tower Defense is a tower defense game where you try to defend the Earth from waves of alien invaders. Tower defense games are a shoot off of the real-time strategy genre where decision making, and strategy decide whether you win or lose. Like most RTS games, the game will be viewed from a top-down perspective. Enemies will follow a path from the top of the screen down to Earth. Towers can be placed in sections by the path but not on to it. For every enemy you kill, you will earn currency to build more towers to defend the Earth from increasingly difficult to kill waves of aliens. This will culminate in one or several boss waves to determine if your strategy was efficient enough for your survival. If an enemy reaches Earth, you will lose one life, and if a boss reaches Earth, you will lose the game. We will try to have a few unique towers to choose from that function differently from each other, such as a sniper and an area of effect tower. If time permits, we will incorporate some type of upgrade system where players will be able to increase the power of already constructed towers through either conjoined building or paying for upgrades. 
