Here are the decided features (So far):
-You have a Health bar and a Shield Bar.
-At least 20 types of enemies
-Around 5 different bosses
-There will be 10 weapons (Grouped into five colors. Left click and right click will fire the different types)
-Around 25 levels (Plus some bonus levels)
-A fairly good plot (Haven't completed that yet
-A Shop for you to buy Upgrades for your ship's weapons and Health.