跟随移动

distance = Vector2.Distance(transform.position, player.transform.position);
Vector2 direction = player.transform.position - transform.position;
direction.Normalize();
float angle = Mathf.Atan2(direction.y, direction.x) * Mathf.Rad2Deg;
transform.position = Vector2.MoveTowards(this.transform.position, player.transform.position, speed * Time.deltaTime);
transform.rotation = Quaternion.Euler(Vector3.forward * angle);