Alien Hunter

Modified 2D Shooter project for CAS 117. Modifications include:

1. An endless mode.
2. A new level.
3. The two already existing levels have been redone into actual levels. Additionally, the music on the second level has been changed.
4. Modified versions of four enemies:
   1. Straight and diagonal chasing shooters have been modified to be faster with speed and fire rate, as well as having more health. I've also made spawners for this variant. There is also another variant with even more health, slower movement, large projectiles, and are larger in size.
   2. Straight and diagonal stationary shooters have been modified to be bigger, fire faster, have more health, and have bigger projectiles.
5. New background for main menu and moved the buttons and game name.
6. Changed level select and instructions menus to be in line with main menu changes.
7. Added instructions to the instructions menu.
8. Removed score and high score display (excluding endless) as they don't feel meaningful for this game.