Unit sized gaps between my blocks?

I used the script below and this tutorial to follow along: https://www.youtube.com/watch?v=nrSUYMnySR4

using UnityEngine; using System.Collections;

public class Levels : MonoBehaviour {

 private int levelWidth;
 private int levelHeight;

 public Transform NcolWoodOneTile;
 public Transform NcolGrassOneTile;
 private Color[] tileColors;

 public Color NcolWoodOneColor;
 public Color NcolGrassOneColor;

 public Texture2D levelTexture;![alt text][1]

 // Use this for initialization
 void Start () {
     levelWidth = levelTexture.width;
     levelHeight = levelTexture.height;
     loadLevel ();
 }
 
 // Update is called once per frame
 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] == NcolWoodOneColor)
             {
                 Instantiate(NcolWoodOneTile, new Vector3(x, y), Quaternion.identity);
             }
             if(tileColors[x+y*levelWidth] == NcolGrassOneColor)
             {
                 Instantiate(NcolGrassOneTile, new Vector3(x, y), Quaternion.identity);
             }
         }
     }
 }

}

[1]: /storage/temp/34992-screenshot+(70).png