Game blueprint

My game will be a battle between a hero and a villain. The villain wants to take over the universe, as the hero you must prevent the villain from taking over the entire universe. I will use both people and aliens as my sprites. I will have a planet as the background. When you get hit with an object or throw an object your or your enemy's health will go down. The difficulty will increase as the enemy uses more power. He will use more and more tricks to try to beat you as the battle goes on. There will be many levels in the battle each will only get harder.