Time for action – updating and drawing the EnemyManager

1. Add the Update() method to the EnemyManager class:

   Public Sub Update(gameTime As GameTime)
     EnemyShotManager.Update(gameTime)
   
     For x As Integer = Enemies.Count - 1 to 0 Step -1
         Enemies(x).Update(gameTime)
         if Not Enemies(x).IsActive() Then
             Enemies.RemoveAt(x)
         Else
             If CSng(rand.Next(0, 1000)) / 10 <= shipShotChance Then
               Dim fireLoc As Vector2 = Enemies(x).EnemySprite.Location
               fireLoc += Enemies(x).gunOffset
   
               Dim shotDirection As Vector2 =
                   _playerManager.playerSprite.Center -
                   fireLoc
   
               EnemyShotManager.FireShot(
                   fireLoc, 
                   shotDirection,
                   False)
             End If
         End If
       Next
   
       If Active Then
           updateWaveSpawns(gameTime)
       End If
   End Sub

2. Add the Draw() method to the EnemyManager class:

   Public Sub Draw(spriteBatch As SpriteBatch)
       EnemyShotManager.Draw...