STICKMAN SHOOTING ZOMBIE SQUARES GAME. UPDATE PLAYER MOVEMENT WITH WASD. ZOMBIES DIE TO BULLETS. ZOMBIES SPAWN FAR AWAY AND MOVE SLOWLY TOWARDS THE PLAYER. PLAYER DIES TO ZOMBIES. MOUSE IS USED TO AIM BULLET DIRECTION AND TO BURSTFIRE BULLETS on cooldown. MOVEMENT WITH WASD KEYS. HIGHSCORE IS SAVED. IF MATH.RANDOM < 0.05 SPAWN ZOMBIE