Strafing diagonally using get.axis in Unity 5?

Hi all! I know there is information on freezing axis around but 'constraints' have been deprecated and the documentation on 'freeze' is a one-liner. Also, my character is moving using get.axis which is powered with just a horizontal and vertical axis. My code allows movement to be recognized and for melee attacks to be carried out in 8 directions, but it doesn't seem to have brought me any closer to the goal of strafing. Here is my relevant code:

 private bool moveRight = false, moveLeft = false, moveUp = false, moveDown = false;
 
     void Start ()
     {
         playerRigid = GetComponent<Rigidbody2D> ();
     }
 
     void Update ()
     {
 
         float inputX = Input.GetAxis ("Horizontal");
         float inputY = Input.GetAxis ("Vertical");
 
         movement = new Vector2 (
             speed.x * inputX,
             speed.y * inputY);
 
 
          if (movement.x > 0f) {
             moveRight = true; moveLeft = false; moveUp = false; moveDown = false;
             Debug.DrawLine (lineStart.position, rightLineEnd.position, Color.green);
         } 
 
         if (movement.x < 0f) {
             moveRight = false; moveLeft = true; moveUp = false; moveDown = false;
             Debug.DrawLine (lineStart.position, leftLineEnd.position, Color.green);
         } 
             
         if (movement.y < 0f) {
             moveRight = false; moveLeft = false; moveUp = false; moveDown = true;
             Debug.DrawLine (lineStart.position, downLineEnd.position, Color.green);
 
         } if (movement.y > 0f) {
             moveRight = false; moveLeft = false; moveUp = true; moveDown = false;
             Debug.DrawLine (lineStart.position, upLineEnd.position, Color.green);
         
         }
 
 
         if (movement.x > 0f  && movement.y > 0f) {
             moveRight = true; moveLeft = false; moveUp = true; moveDown = false;
             Debug.DrawLine (lineStart.position, upRightLineEnd.position, Color.green);
         } 
 
         if (movement.x < 0f  && movement.y > 0f) {
             moveRight = false; moveLeft = true; moveUp = true; moveDown = false;
             Debug.DrawLine (lineStart.position, upLeftLineEnd.position, Color.green);
         } 
 
         if (movement.x > 0f  && movement.y < 0f) {
             moveRight = true; moveLeft = false; moveUp = false; moveDown = true;
             Debug.DrawLine (lineStart.position, downRightLineEnd.position, Color.green);
         } 
 
         if (movement.x < 0f  && movement.y < 0f) {
             moveRight = false; moveLeft = true; moveUp = false; moveDown = true;
             Debug.DrawLine (lineStart.position, downLeftLineEnd.position, Color.green);
         } 
 
         Raycasting ();
 
     }
         
     void FixedUpdate ()
     {
         playerRigid.velocity = movement;
 
     }
 
     void Raycasting()
         {
                 
                 
         if (Physics2D.Linecast (lineStart.position, rightLineEnd.position, 1 << LayerMask.NameToLayer ("Enemy1")) && moveRight == true) {
             whatIHit = Physics2D.Linecast (lineStart.position, rightLineEnd.position, 1 << LayerMask.NameToLayer ("Enemy1"));
                 }
 
         if (Physics2D.Linecast (lineStart.position, leftLineEnd.position, 1 << LayerMask.NameToLayer ("Enemy1"))  && moveLeft == true) {
             whatIHit = Physics2D.Linecast (lineStart.position, leftLineEnd.position, 1 << LayerMask.NameToLayer ("Enemy1"));
 
                 }
         if (Physics2D.Linecast (lineStart.position, upLineEnd.position, 1 << LayerMask.NameToLayer ("Enemy1"))  && moveUp == true) {
             whatIHit = Physics2D.Linecast (lineStart.position, upLineEnd.position, 1 << LayerMask.NameToLayer ("Enemy1"));
 
                 }
 
         if (Physics2D.Linecast (lineStart.position, downLineEnd.position, 1 << LayerMask.NameToLayer ("Enemy1"))  && moveDown == true) {
             whatIHit = Physics2D.Linecast (lineStart.position, downLineEnd.position, 1 << LayerMask.NameToLayer ("Enemy1"));
 
         }
 
         if (Physics2D.Linecast (lineStart.position, upRightLineEnd.position, 1 << LayerMask.NameToLayer ("Enemy1"))  && moveUp == true && moveRight == true) {
             whatIHit = Physics2D.Linecast (lineStart.position, upRightLineEnd.position, 1 << LayerMask.NameToLayer ("Enemy1"));
 
         }
 
         if (Physics2D.Linecast (lineStart.position, upLeftLineEnd.position, 1 << LayerMask.NameToLayer ("Enemy1"))  && moveUp == true && moveLeft == true) {
             whatIHit = Physics2D.Linecast (lineStart.position, upLeftLineEnd.position, 1 << LayerMask.NameToLayer ("Enemy1"));
 
         }
 
         if (Physics2D.Linecast (lineStart.position, downRightLineEnd.position, 1 << LayerMask.NameToLayer ("Enemy1"))  && moveDown == true && moveRight == true) {
             whatIHit = Physics2D.Linecast (lineStart.position, downRightLineEnd.position, 1 << LayerMask.NameToLayer ("Enemy1"));
 
         }
 
         if (Physics2D.Linecast (lineStart.position, upLeftLineEnd.position, 1 << LayerMask.NameToLayer ("Enemy1"))  && moveUp == true && moveLeft == true) {
             whatIHit = Physics2D.Linecast (lineStart.position, downLeftLineEnd.position, 1 << LayerMask.NameToLayer ("Enemy1"));
 
         }
 
         if (Input.GetKeyDown (KeyCode.E) && mUpgrade1 == false) {
             whatIHit.collider.gameObject.GetComponent<EnemyHealth>().DamageE1();
         }
             
         if (Input.GetKeyDown (KeyCode.E) && mUpgrade1 == true) {
             whatIHit.collider.gameObject.GetComponent<EnemyHealth>().DamageE2();
         }
 
         }

Just a simple if statement (or a series of them, I only need a start) to take a key input to lock the axis of the direction the player is facing/attacking. This would really help, thanks so much!