Real concept of Vector2.Reflect

so the bounce movement which i though would be pretty straight forward turned out to be a pain, as i am in the begging stages i want to learn how to use 2D vector2.reflect rather than using physics material for my ball bounce "LearnGame", All though i found lots of stuff about this in the internet don't feel like anyone explained how it would work for 2D well.

So for the real question i created this ball which moves toward a box and when it hits the box i want it to reflect and move accordingly . I don't this i understand the whole concept

![Example][1] [1]: /storage/temp/114810-t9br8.png

Please help me understand how it works for 2D or guide me to the right tutorial.

I tried to achieve this with below code but for some reason , when my ball hit the box, ball becomes flat as in the scale changes, don't understand it at all.

 private void OnCollisionEnter2D(Collision2D collision)
 {
 Ray2D ray = new Ray2D(transform.position, transform.right);
         
 
         Vector2 reflectDire = Vector2.Reflect(ray.direction, hit.normal);
         float rot = 90 - Mathf.Atan2(reflectDire.y, reflectDire.x) * Mathf.Rad2Deg;
         transform.eulerAngles = new Vector2(rot, 0);
 }