• animate() : enemies.EnemyShip , powerUps.Health100 , powerUps.Health25 , player.Laser , player.Ship
• down() : menu.Menu , player.Ship , volume.Volume
• draw() : credits.Credits , menu.Menu , volume.Volume
• getImageGrid() : spriteTools.SpriteSheet
• getImagePixel() : spriteTools.SpriteSheet
• left() : player.Ship , volume.Volume
• press() : menu.Menu , volume.Volume
• right() : player.Ship , volume.Volume
• scroll() : background.Background
• up() : menu.Menu , player.Ship , volume.Volume
• update() : powerUps.PowerUp , player.Laser , enemies.EnemyShipX003 , enemies.EnemyShipX002 , enemies.EnemyShipX001 , powerUps.Health25 , powerUps.Health100