Having trouble with player.transform

I've spent over 2 hours going over this and I can't seem to find what is wrong with my coding. For some reason it just won't move the player. This is my coding (a lot of stuff that I don't really think is causing the problem, the real problem is at the ending):

 using UnityEngine;
 using System.Collections;
 
 public class Level : MonoBehaviour {
     
     private int levelWidth;
     private int levelHeight;
 
     public Transform grassTile;
     public Transform stoneBrickTile;
 
     private Color[] tileColors;
 
     public Color grassColor;
     public Color stoneBrickColor;
     public Color spawnPointColor;
 
     public Texture2D levelTexture;
 
     public Entity player;
 
     void Start () {
         levelWidth = levelTexture.width;
         levelHeight = levelTexture.height;
         loadLevel();
     }
 
     void Update () {
     
     }
 
     void loadLevel()
     {
         tileColors = new Color[levelWidth * levelHeight];
         tileColors = levelTexture.GetPixels ();
         
         for(int y = 0; y < levelHeight; y++)
         {
             for(int x = 0; x < levelWidth; x++)
             {
                 if(tileColors[x+y*levelWidth] == grassColor)
                 {
                     Instantiate(grassTile, new Vector3(x, y), Quaternion.identity);
                 }
                 if(tileColors[x+y*levelWidth] == stoneBrickColor)
                 {
                     Instantiate(stoneBrickTile, new Vector3(x, y), Quaternion.identity);
                 }
                 if(tileColors[x+y*levelWidth] == spawnPointColor)
                 {
                     Instantiate(grassTile, new Vector3(x, y), Quaternion.identity);
                     Vector3 pos = new Vector3(x, y);
                     player.transform.position = pos;
                 }
             }
         }
     }
 }

I've replaced the grassTile with other tiles just to see if it replaces it like it should and it does. It just doesn't want to put my character there.