Recommended Layers
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  - Projectiles

    This layer should manage bullets, grenades, lasers and anything that is
    supposed to fly around and hurt others.

    Projectiles collide with both the player layer and enemy layer but their
    controller can decide if they're smart projectiles (can't hurt the player)

  - Items

    Layer for things the player can pick up. Should only collide with
    the player layer normally.

  - Enemies

    Obviously for enemies.

  - Player

    The player.

  - Solid

    Things the player cannot pass through

  - Triggers

    Things that trigger traps, story events and the like

  - Navigation

    Information for the navigation system