feature/boss_final

• development of boss object and moving pattern
• development of 3 types of final boss bullets

feature/boss_mid

• development of boss interface
• development of middle boss abstract class
• development of omega boss object and moving pattern

feature/enemy_formation

• development of normal enemy diagonal movement. moves in a diamond-like pattern, continuously bouncing off screen boundaries

feature/player_move

• development of player vertical and horizontal movement.

feature/ship-enemy-collision-damage

• development of ship-enemy collision detection system with instant life loss

feature/enemy_special

• development of Left-Right Repetitive Movement Pattern