shrink.cs

    void FixedUpdate()
    {
        //rigidBody.AddForce(Vector3.down * 5);
        if (direction)
        {
            transform.localScale += new Vector3(sizeValue, sizeValue, sizeValue) * Time.deltaTime;
            sizeCounter++;
            if (sizeCounter > 50)
            {
                direction = !direction;
            }
        }
        else
        {
            transform.localScale -= new Vector3(sizeValue, sizeValue, sizeValue) * Time.deltaTime;
            sizeCounter--;
            if (sizeCounter < 2)
            {
                direction = !direction;
            }
        }
    }