Added Health pickup, started pickup assignment through level control and added enemy counter

scripts/bullet_enemy.gd

@@ -38,7 +38,7 @@ func _process(delta):
 	position += transform.basis * Vector3(0, 0, -bullet_speed) * delta
 	rotation.x = clamp(rotation.x - delta * bullet_drop,deg_to_rad(-90),deg_to_rad(90))
 	
-	if ray.is_colliding():
+	if ray.is_colliding() and ray.get_collider != null:
 		if ray.get_collider().is_in_group("player"):
 			var player = ray.get_collider()
 			player.level_control.health -= bullet_damage