Player now has a score.
HUD JPanel for graphics has been added to keep track of player progress.
Some names edited
Player score is changed if shot or shoots enemy.
Using GridBagLayout, now set up with HUD on same frame. Sized properly.
This also allowed me to center the game window.
Player is now passed between levels (keeps score, health, etc.)
Full-screen now has a few actions dependent, so control has been moved to a boolean rather than commenting out.