First Level:  added minion's appearance based on conditionals and they appear in relation to Goku's position and level location.  Added background music to first level.
Cell:  made him the first level enemy.
For Cell, Minions, and Goku the animation is created and begins to run in the set up methods for each.
Added horizontal flipping of enemies as their position changes in relation to Goku.
Added a blast sound to Goku's power balls when he releases and shoots them.