Smooth dash movement for topdown 2D game?

If you're looking for a consistent dodge that happens over time, there's a couple ways to do it. You could use a coroutine or you could use Update and a "dodge flag". For example, a coroutine could look like this:

    /// <summary>
     /// Dodge distance/speed that gets processed every frame. Might wanna keep this low! 
     /// </summary>
     private float _dodgeSpeed = 60000;
     
     /// <summary>
     /// How long dodges last.
     /// </summary>
     private float _dodgeTime = 0.5f; 
     
     /// <summary>
     /// Reference to the dodging coroutine.
     /// </summary>
     private Coroutine _dodging; 
     
     private void Update()
     {
         if (Input.GetKeyDown(KeyCode.LeftControl) && _dodging == null)
         {
             _dodging = StartCoroutine(DodgeCoroutine());
         }
     }

     private IEnumerator DodgeCoroutine()
     {
         var endOfFrame = new WaitForEndOfFrame();
         var rigidbody = GetComponent<Rigidbody>();
         
         for (float timer = 0; timer < _dodgeTime; timer += Time.deltaTime)
         {
             rigidbody.MovePosition(transform.position + (transform.forward * (_dodgeSpeed * Time.deltaTime)));
             
             yield return endOfFrame;
         }

         _dodging = null;
     }

For an Update() implementation you would do the same thing but replace the _dodging Coroutine with a _dodging boolean. Then, if (_dodging) aforementionedLogic();