-Added new alien missions. They duplicate the existing ones, but start from the alien base. As planned, it should add meaning to the presence of alien bases.
-Added Gauss weapon. It has the same power as a laser, but the type of attack is like a firearm. Essentially, it needs something more powerful than firearms, until there are enough materials to create enough lasers.
-Added F-16 as initial fighter. According to the characteristics, it is almost like a steam grabber, but the price is somewhat lower and you cannot change weapons on it.