Make movement of an object independant.

Hello!

I am making a top down 2d game. My character has currently a movement script and a rotation script (i like to keep things separated). The movment script is simple; press W to go up, A to go left, S to go down and D to go right. The rotation script makes the character always face the mouse cursor.

The problem is that when in gamemode the character moves right if he is facing right when i press W, he moves left if he is facing left when i press W.

He moves where he is facing when i want him to go up. This applies for every direction. He needs to look at the direction he is going for the controls to make sence. How could i "seperate" the movement from the rotation?

This is the movement script by the way:

 using UnityEngine;
 using System.Collections;
 
 public class PlayerMovement : MonoBehaviour {
 
     public float speed;    
 
     void Update () {
         Movement ();
     }    
 
     void Movement()
     {
         if (Input.GetKey (KeyCode.D)) {
             transform.Translate (Vector2.right * speed * Time.deltaTime);
         }
         if (Input.GetKey (KeyCode.W)) {
             transform.Translate (Vector2.up * speed * Time.deltaTime);
         }
         if (Input.GetKey (KeyCode.A)) {
             transform.Translate (-Vector2.right * speed * Time.deltaTime);
         }
         if (Input.GetKey (KeyCode.S)) {
             transform.Translate (-Vector2.up * speed * Time.deltaTime);
         }
         if ((Input.GetKey (KeyCode.A) && Input.GetKey (KeyCode.W))
             ||(Input.GetKey (KeyCode.W) && Input.GetKey (KeyCode.D))
             ||(Input.GetKey (KeyCode.D) && Input.GetKey (KeyCode.S))
             ||(Input.GetKey (KeyCode.S) && Input.GetKey (KeyCode.A))) 
         {    
             speed = 0.85f;
         } else {
             speed = 1.2f;
         }
     }
                         
 }

This is the rotation script:

 using UnityEngine;
 using System.Collections;
 
 public class LookAtMouse : MonoBehaviour {
 
     void Update () {
         //rotation
         Vector3 mousePos = Input.mousePosition;
         mousePos.z = 5.23f;
         
         Vector3 objectPos = Camera.main.WorldToScreenPoint (transform.position);
         mousePos.x = mousePos.x - objectPos.x;
         mousePos.y = mousePos.y - objectPos.y;
         
         float angle = Mathf.Atan2(mousePos.y, mousePos.x) * Mathf.Rad2Deg;
         transform.rotation = Quaternion.Euler(new Vector3(0, 0, angle-90));
     }
 }

Thank you in advance!