Time for action – implementing game states

1. Add declarations to the Game1 class for our GameState enum:

   Private Enum GameState
       TitleScreen
       Playing
       PlayerDead 
       GameOver
   End Enum
   
   Private _gameState As GameState = GameState.TitleScreen

2. Still in the declaration section of the Game1 class, add vectors for the display position of our text items, a texture to hold the title screen image, and the delay before respawn when the player dies:

   Private gameOverPosition As Vector2 = New Vector2(350, 300)
   Private livesPosition As Vector2 = New Vector2(600, 580)
   
   Private titleScreen As Texture2D
   
   Private deathTimer As Single = 0
   Private deathDelay As Single = 5

3. We currently have temporary code in the LoadContent() method that loads straight into the first level of the game. Replace the current LoadContent() method with the following code:

   Protected Overrides Sub LoadContent()
       spriteBatch = New SpriteBatch(GraphicsDevice)
   
       TileMap.Initialize(
           Content.Load(Of Texture2D)("Textures...