I'm making a 2D endless runner game that inspired by Dino Google Game.

I put PlatformSpawner outside to right of camera view. Then I put PlatformSpawner.cs into it. I made some prefabs called "Platform 01/02/03" etc that includes(empty-parent, child-sprite). Anyway, there is also Rope prefabs that connects Platform prefabs.

PlatformSpawner spawns them, and Platform Parent(empty in the scene) stores them.

Here is the scheme I wanted .enter image description here

Platform Prefabs;
Parent: Empty(Platform.cs, Box Cold 2D)
Child: aa(Sprite Renderer)

Rope Prefabs:
Parent: Empty(Rope.cs)
Child: cc(Sprite Renderer)

I have tried everything but never came close to good result. Is there anyone who can help?

using UnityEngine;

public class PlatformSpawner : MonoBehaviour
{
    [SerializeField] private GameObject[] platformPrefabs;
    [SerializeField] private Transform platformParent;

    public float platformSpawnTime = 2f;
    [Range(0, 1)] public float platformSpawnTimeFactor = 0.1f;
    public float platformSpeed = 1f;
    [Range(0, 1)] public float platformSpeedFactor = 0.2f;

    private float _platformSpawnTime;
    private float _platformSpeed;

    private float timeAlive;
    private float timeUntilPlatformSpawn;

    private void Start()
    {
        GameManager.Instance.onGameOVer.AddListener(ClearPlatforms);
        GameManager.Instance.onPlay.AddListener(ResetFactors);
    }

    private void Update()
    {
        if (!GameManager.Instance.isPlaying) return;

        timeAlive += Time.deltaTime;
        CalculateFactors();
        SpawnLoop();
    }

    private void SpawnLoop()
    {
        timeUntilPlatformSpawn += Time.deltaTime;

        if (timeUntilPlatformSpawn >= _platformSpawnTime)
        {
            Spawn();
            timeUntilPlatformSpawn = 0f;
        }
    }

    private void ClearPlatforms()
    {
        foreach (Transform child in platformParent)
            Destroy(child.gameObject);
    }

    private void CalculateFactors()
    {
        _platformSpawnTime = platformSpawnTime / Mathf.Pow(timeAlive, platformSpawnTimeFactor);
        _platformSpeed = platformSpeed * Mathf.Pow(timeAlive, platformSpeedFactor);
    }

    private void ResetFactors()
    {
        timeAlive = 1f;
        _platformSpawnTime = platformSpawnTime;
        _platformSpeed = platformSpeed;
        timeUntilPlatformSpawn = 0;
    }

    private void Spawn()
    {
        GameObject prefab = platformPrefabs[Random.Range(0, platformPrefabs.Length)];
        GameObject spawned = Instantiate(prefab, transform.position, Quaternion.identity);

        spawned.transform.SetParent(platformParent, true);

        Platform mover = spawned.GetComponent();
        mover.Init(_platformSpeed);
    }
}

using UnityEngine;

public class Platform : MonoBehaviour
{
    private float speed;
    private float destroyXPosition = -20f;

    public void Init(float moveSpeed)
    {
        speed = moveSpeed;
    }

    private void Update()
    {
        transform.position += Vector3.left * speed * Time.deltaTime;

        if (transform.position.x < destroyXPosition)
            Destroy(gameObject);
    }
}

using UnityEngine;

public class Rope : MonoBehaviour
{
    //nothing
}

I have also added a GroundStart(Black One), it just stays there to make sure to player not to fall at the start. It moves to left with a simple code. Red dot is PlatformSpawner.

enter image description here