Object Orientedness
[-3] Style
       no driver class included
       ideally have fewer hard coded values; have the panel class be in charge of
       knowing the size/properties of the window and the object classes only be
       passed the information as needed
       need to comment the purpose of all instance data
PlayerXX
ObstaclePanelXX
paintComponent
[-1] Button Listeners
       moved up to the walls of the space rather than just not moving if would
       leave playing field
TargetXX
[-9] collides method
       [10] logic for all directions
       no collides method in Player class - attempt coded into Panel class
       conditions incorrect - requires a perfect alignment and not just overlap
       in y-axis
[-3] Collision detection with target
       no code to prevent further moves after a win
BlockersXX
[-2] Collision detection with blocker
       same collision detection issues as with target
Additional blockers
       Same collision issues as above
[-6] Horizontal movement of blockers
       not attempted
[-5] Bouncing blockers

       not attempted