Unity 2D C# Follow Mouse Cursor

C# script to follow mouse cursor by GameObject.

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
 
// ? 2017 TheFlyingKeyboard and released under MIT License
// theflyingkeyboard.net

public class FollowMouse : MonoBehaviour {
    public float moveSpeed = 0.004f;

    // Use this for initialization
    void Start () {
    }
  
  // Update is called once per frame
  void Update () {
        transform.position = Vector2.Lerp(transform.position, Camera.main.ScreenToWorldPoint(Input.mousePosition), moveSpeed);
        
        Vector3 difference = Camera.main.ScreenToWorldPoint(Input.mousePosition) - transform.position;
        difference.Normalize();
        float rotation_z = Mathf.Atan2(difference.y, difference.x) * Mathf.Rad2Deg;
        transform.rotation = Quaternion.Euler(0f, 0f, rotation_z);
    }
}