In class Player you are wrongly creating a new Game1 theGame1 = new Game1(); instance. That means you are trying to run 2 games at once. This is not what you are trying to do. Your Game should only have 1 instance and that is in your Program.cs file in the main method which starts running your game:
static void Main(string[] args)
{
using (Game1 game = new Game1())
{
//this is where you game begins, and the Game1() constructor
//then initialize is called, and [ Update() , Draw() ] functions keep looping
game.Run();
}
}
Remove Game1 theGame1 completely from your classes and use XNAInvaders.Game1.VariableName instead (or you could add using XNAInvaders; and then use Game1.VariableName, but since you have all classes under the same namespace (XNAInvaders), you can simply use Game1.VariableName without having to add the using statement).
So do
void FireBullet()
{
Bullet newBullet = new Bullet(position);
newBullet.Init();
Game1.bullets.Add(newBullet);
}
So basically, every variable you have in the Game1 class can be accessed by using Game1.VariableName in any other class.
However are you sure you need a Bullet list in your Game1 class ? You should keep your Game1.cs as simple as possible. You could design it a bit better, using more classes(?) so that the Game1.cs isn't that messy, it really makes a difference when your game becomes more complicated (Perhaps with using something along the lines of Level.cs to keep the variables there)
Edit: I forgot to mention something important, you have to make your Game1 Variables static and public if you want to access them from other classes (because you will obviously have a single Game1 instance right ? So why would the variables not be static)
