Unity 2D 游戲中物體始終看向某個點（朝向問題）

public GameObject lookPoint;
public Vector3 direction;

void Start()
{

}

// Update is called once per frame
void Update()
{
direction = lookPoint.transform.position - transform.position;
if(Vector3.Angle(direction, transform.right) > 90f) // 目標點在右邊
{
transform.Rotate(transform.forward, Vector3.Angle(direction, transform.up));
}
else // 目標點在左邊
{
transform.Rotate(transform.forward, -Vector3.Angle(direction, transform.up));
}
}