2D Space Shooter [Modified!] - MSU

This is my modified 2D Space Shooter. [Modifications] - Added instructions on the instruction screen - Composed 3 new songs (one on the Main Menu Page, one in Level 1 and Level 2, and one in Level 3) - Added a "Challenge" Level: see how long you can last through a wave of endless aliens! - Modified levels. -Created a new sprite for the space ship -Drew new backgrounds for every level