Rotation, the object at the center will rotate towards the target

Rotate.cs

Vector3 pos = Camera.main.ScreenToWorldPoint (new Vector3 (${Target}.position.x, ${Target}.position.y, 5));
float angle = Mathf.Atan((pos.y - ${Center}.position.y) / (pos.x - ${Center}.position.x)) * Mathf.Rad2Deg;
if(pos.x < transform.position.x){ angle += 180; } // avoid 'flipping' the rotation
${Center}.transform.rotation = Quaternion.Euler(0, 0, angle);