Player rotate to face mouse position??

I've been trying to get my player to face my mouse, because I'm trying to make a 2D game where the player shoots to where the mouse is pointing...

My code looks like this:

Code (CSharp):

1.  
2. using System.Collections;
3. using System.Collections.Generic;
4. using UnityEngine;
5.  
6. public class PlayerMovement : MonoBehaviour{
7.  
8.     [SerializeField] private float speed;
9.     private float horizontalInput;
10.     private float verticalInput;
11.     private Rigidbody2D body;
12.     private BoxCollider2D boxCollider;
13.    
14.  
15.     private void Awake(){
16.         body = GetComponent<Rigidbody2D>();
17.         boxCollider = GetComponent<BoxCollider2D>();
18.     }//Awake
19.  
20.     private void Update(){
21.         //Player movement
22.         horizontalInput = Input.GetAxis("Horizontal");
23.         verticalInput = Input.GetAxis("Vertical");
24.  
25.         body.velocity = new Vector2(Input.GetAxis("Horizontal") * speed,Input.GetAxis("Vertical") * speed);
26.  
27.         //Rotate the body to face mouse
28.         LookAtMouse();
29.     }//Update
30.  
31.     private void LookAtMouse(){
32.         float directionx = Input.mousePosition.x - transform.position.x;
33.         float directiony = Input.mousePosition.y - transform.position.y;
34.         float angle = Mathf.Atan2(directiony, directionx) * Mathf.Rad2Deg;
35.         body.rotation = angle;
36.     }//LookAtMouse
37. }//PlayerMovement
38.  

Can someone help me? Why doesn't this work? My player is rotating, but it only kind of works when my mouse is between roughly 0 degrees and 90 degrees relative to the player...

 

Plenty of vids for this,

Unity Tutorials: Look at Mouse on Screen - YouTube

 

This is for 3D though.. I only want to rotate the player on the z axis, not all axes..

 

Sorry, try this, Unity Nuggets: How to "Look At" Mouse in 2D Game - YouTube, plenty of options to look at in a google search.

 

Thank you so much!! I'm surprised I didn't come across this myself, I was desperately searching for this, but never found it... But thanks!