Character rotation and move to mouse click point with speed

I need simulate forward rotation of the character in my 2D game project.

I have tried to create my movement script but it doesn't works perfect. The reason is my 2D actor is spaceship and it can't do rotation around his axis but i need just forward rotation for it.

Like this:

My script code is:

 using UnityEngine;
 using System.Collections;
 
 public class Move : MonoBehaviour {
 
     public float speed = 1.5f;
     public float rotationSpeed = 90f;
     private Vector3 pos;
     private Quaternion qTo;
 
     void Start () {
         pos = transform.position;
         qTo = transform.rotation;
     }
 
     void Update () {
         if (Input.GetMouseButtonDown(0) || Input.GetMouseButton(0)) {
             pos = Input.mousePosition;
             pos.z = transform.position.z - Camera.main.transform.position.z;
             pos = Camera.main.ScreenToWorldPoint(pos);
         }
 
         var dir = pos - transform.position;
 
         if (dir != Vector3.zero) {
             qTo = Quaternion.LookRotation(Vector3.forward, pos - transform.position);
             transform.rotation = Quaternion.RotateTowards (transform.rotation, qTo, Time.deltaTime * rotationSpeed);
         }
 
         transform.position = Vector3.MoveTowards(transform.position, pos, Time.deltaTime * speed);
     }    
 }

Please help me to correct my script for more proper rotation and moving. Thank you