Script for Tiago my friend - Rotate objects on curve of infinity runner game

SpawnTile.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class SpawnTile : MonoBehaviour
{
  public GameObject tileOnLine;
  public GameObject tileOnCurve;
  public GameObject referenceObject;
  public float timeOffset = 0.4f;
  public float distanceBetweenTiles = 5.0F;
  [Range(0, 100)]
  public int porcentageToChangeCurve = 20;
  private Vector3 previousTilePosition;
  private float startTime;
  private Vector3 currentDirection, mainDirection = new Vector3(0, 0, 1), otherDirection = new Vector3(1, 0, 0);
  private Vector3 objectRotation = new Vector3(0, 0, 0);
  private Vector3 curveRotation = new Vector3(0, 0, 0);
  private bool directionChanged = false;


  // Start is called before the first frame update
  void Start()
  {
    previousTilePosition = referenceObject.transform.position;
    startTime = Time.time;
  }

  // Update is called once per frame
  void Update()
  {
    if (Time.time - startTime > timeOffset)
    {
      GameObject objectToSpawn = tileOnLine;

      // Check if will change direciton
      if (Random.value < ((100 - (float)porcentageToChangeCurve) / 100) && !directionChanged)
        currentDirection = mainDirection;
      else if (directionChanged)
      {
        Vector3 temp = currentDirection;
        currentDirection = otherDirection;
        mainDirection = currentDirection;
        otherDirection = temp;

        // Change next roration of object
        objectRotation.y = objectRotation.y + 90;

        directionChanged = false;
      }
      else
      {
        //Before change direction, create a curve for this.
        objectToSpawn = tileOnCurve;
        directionChanged = true;
      }


      Vector3 spawnPos = previousTilePosition + distanceBetweenTiles * currentDirection;
      startTime = Time.time;

      if (objectToSpawn == tileOnLine) //When tile of line, spawn with rotation
      {
        Instantiate(objectToSpawn, spawnPos, Quaternion.Euler(objectRotation.x, objectRotation.y, objectRotation.z));
      }
      else // Else instantiate with default rotation 
      {
        Instantiate(objectToSpawn, spawnPos, Quaternion.Euler(curveRotation.x, curveRotation.y, curveRotation.z));
        //Change curve more rottation
        curveRotation.y = curveRotation.y + 180;
      }

      previousTilePosition = spawnPos;
    }
  }
}