Random tiles Generation in Unity 2d game at runtime

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using System.Collections;

using System.Collections.Generic;

using UnityEngine;

public class TilesGenerator : MonoBehaviour

{

    private Camera mainCam;

    public GameObject Player;

    public GameObject[] Tiles;

    float spawnY;

    // Use this for initialization

    void Start () {

        mainCam = Camera.main;

        spawnY = mainCam.transform.position.y + 3.0f;

    }

   

    // Update is called once per frame

    void Update ()

    {

        if (mainCam.transform.position.y < Player.transform.position.y)

        {

            Vector3 targetPos = new Vector3

                (

                    mainCam.transform.position.x,

                    Player.transform.position.y,

                    mainCam.transform.position.z

                );

           mainCam.transform.position = Vector3.Lerp

                (

                    mainCam.transform.position,

                    targetPos,

                    0.5f

                );

        } //endif

        if (mainCam.transform.position.y > spawnY)

        {

            spawnY += Random.Range(3,4.5f);

            float spawnX = Random.Range(-5f,5f);

            SpawnTile(new Vector3(spawnX, spawnY));

        }

    }

    void SpawnTile(Vector3 pos)

    {

        pos.z = -0.99f;

        int RandomTile = Random.Range(0, Tiles.Length - 1);

        Instantiate(Tiles[RandomTile],pos,Tiles[RandomTile].transform.rotation);

    }

}