Problem with 2D Rotation

I am making a game where I need to draw a Straight line using touch control. I wrote this script, but the rotation is weird, it seems reversed,could someone help me with that please ?

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class PlatformSpawn : MonoBehaviour
6. {
7.     public GameObject platform;
8.     public float speed = 10.0f;
9.     private GameObject createdPlatform;
10.     private Vector2 firstPosition;
11.     private Vector2 movePosition;
12.  
13.     void Update()
14.     {
15.         if(Input.touchCount>0)
16.         {
17.             Touch touch = Input.GetTouch(0);
18.  
19.             if (touch.phase == TouchPhase.Began)
20.             {
21.                 firstPosition = Camera.main.ScreenToWorldPoint(touch.position);
22.                 createdPlatform = Instantiate(platform, firstPosition, Quaternion.identity);
23.  
24.                
25.             }
26.  
27.             else if (touch.phase == TouchPhase.Moved)
28.                 {
29.                 movePosition = Camera.main.ScreenToWorldPoint(touch.position);
30.  
31.                 float hypotenuse = Mathf.Sqrt(Mathf.Pow((firstPosition.x - movePosition.x), 2) + Mathf.Pow((firstPosition.y - movePosition.y), 2));
32.                 createdPlatform.transform.localScale = new Vector3(hypotenuse*2,0.3f, 1.0f);
33.  
34.  
35.                 float deltaPosition_x = movePosition.x - firstPosition.x;
36.                 float deltaPosition_y = movePosition.y - firstPosition.y;
37.                 float platformRotation = Mathf.Atan2(deltaPosition_x, deltaPosition_y) * Mathf.Rad2Deg;
38.                 createdPlatform.transform.rotation = Quaternion.AngleAxis(platformRotation,Vector3.forward);
39.  
40.                 createdPlatform.transform.parent = transform;
41.                 }
42.  
43.         }
44.     }
45. }
46.