Time for action – updating the Game1 class

1. Add the following declarations to the Game1 class:

   Public Enum GameStates 
       TitleScreen
       Playing
       WaveComplete
       GameOver
   End Enum
   
   Private gameState As GameStates = GameStates.TitleScreen
   
   Private gameOverTimer As Single = 0
   Private gameOverDelay As Single = 6
   
   Private waveCompleteTimer As Single = 0
   Private waveCompleteDelay As Single = 6

2. Remove the call to GoalManager.GenerateComputers() from the LoadContent() method of the Game1 class.

3. Add the checkPlayerDeath() method to the Game1 class:

   Private Sub checkPlayerDeath()
       For Each enemyTank As Enemy In EnemyManager.Enemies
           If (enemyTank.EnemyBase.IsCircleColliding(
               Player.BaseSprite.WorldCenter,
               Player.BaseSprite.CollisionRadius)) Then
   
               gameState = GameStates.GameOver
           End If
       Next
   End Sub

4. Replace the existing Update() method of the Game1 class with the following code:

   Protected Overrides Sub Update(gameTime As GameTime)
       ' Allows...