/// <summary>
/// Allows the game to run logic such as updating the world,
/// checking for collisions, gathering input, and playing audio.
/// </summary>
/// <param name="gameTime">Provides a snapshot of timing values.</param>
protected override void Update(GameTime gameTime)
{
base.Update(gameTime);
_asteroid1.Update(gameTime);
_asteroid2.Update(gameTime);
_asteroid3.Update(gameTime);
_asteroid4.Update(gameTime);
_asteroid5.Update(gameTime);
Player.Update(gameTime, graphics.PreferredBackBufferWidth);
_bonusHeals.Update(gameTime);
}