Converting 3D Code into 2D Code (vertical endless runner)

Hi guys, I am trying to program a endless vertical runner for school. I got a code working in 3D, one Script attached to a limiter which is not in sight of the camera, and one attached to the player. As I need the game to be 2D I tried transferring it from 3D to 2D. I set everything up and as far as I concerned it should work as well, but somehow it doesn't. It would be great, if u can tell me what to change. It would be awesome, if you could help me. Thanks in advance.

Script attached to the "limiter":

 using System.Collections;
 using UnityEngine.UI;
 
 using System.Collections.Generic;
 using UnityEngine.SceneManagement;
 
 using UnityEngine;
 
 public class EndlessRun : MonoBehaviour {
     public bool isGameOver;
     public List<GameObject> bgList;
     public List<Transform> currentManagedBGList;
     public GameObject lastSpawnedBG;
     public GameObject restartDialog;
     public Vector3 pace;
     public float timess;
     public Vector3 a;
     public float pacea;
     public Text countText;
     public int maxpoints;
     public float time;
     void Start () {
         isGameOver = false;
         restartDialog.SetActive (false);
 
     }
 
     void Update (){        a = Time.deltaTime * Time.timeSinceLevelLoad * Vector3.down * pacea;
         pace = Vector3.down * timess + a;
         if (!isGameOver){
             SetCountText ();
             foreach (Transform t in currentManagedBGList) {
                 t.transform.Translate (pace);
             }
             }
         else {
             restartDialog.SetActive (true);
 
         }
         ;
 
     }
     public void RestartGame() 
     {
         Application.LoadLevel (Application.loadedLevelName);
 
     }
 
 
     private void OnTriggerExit(Collider other)
     {
         if(other.tag.Equals("BG"))
         {
             currentManagedBGList.Remove(other.transform);
             Destroy(other.gameObject);

         Vector3 spawnPos = lastSpawnedBG.transform.position;
         spawnPos.y += lastSpawnedBG.GetComponent<Collider>().bounds.size.y/2;


         lastSpawnedBG = (GameObject) Instantiate(bgList[Random.Range(0, bgList.Count)], spawnPos,Quaternion.identity);
         spawnPos.y += lastSpawnedBG.GetComponent<Collider>().bounds.size.y / 2;
         lastSpawnedBG.transform.position = spawnPos;

         currentManagedBGList.Add(lastSpawnedBG.transform);


     }
 }
 void SetCountText()
 {
     time =  (int) (Time.timeSinceLevelLoad * 10);
     countText.text = time.ToString();

 }
 }

Script attached to the Player

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class ERPlayer : MonoBehaviour {
 
     public EndlessRun er;
     public float minSwipeDistY;
 
     public float minSwipeDistX;
 
     private Vector2 startPos;
 
     void Start () {
         Screen.orientation = ScreenOrientation.Portrait;
     }
     
     void Update () {
         if (Input.touchCount > 0)
 
         {
 
             Touch touch = Input.touches[0];
 
 
 
             switch (touch.phase)
 
             {
 
             case TouchPhase.Began:
 
                 startPos = touch.position;
 
                 break;
 
 
 
             case TouchPhase.Ended:
 
                 float swipeDistVertical = (new Vector3(0, touch.position.y, 0) - new Vector3(0, startPos.y, 0)).magnitude;
 
                 if (swipeDistVertical > minSwipeDistY)
 
                 {
 
                     float swipeValue = Mathf.Sign(touch.position.y - startPos.y);
 
                     if (swipeValue > 0)
                     { }
 
                     else if (swipeValue < 0)
                     { }
 
                 }
 
                 float swipeDistHorizontal = (new Vector3(touch.position.x, 0, 0) - new Vector3(startPos.x, 0, 0)).magnitude;
 
                 if (swipeDistHorizontal > minSwipeDistX)
 
                 {
 
                     float swipeValue = Mathf.Sign(touch.position.x - startPos.x);
 
                     if (swipeValue > 0)//right swipe
                         //if (transform.position.x != 2)
                         transform.Translate(2, 0, 0);
 
 
                     else if (swipeValue < 0)//left swipe
                         //if (transform.position.x != -2)
                         transform.Translate(-2, 0, 0);
 
                 }
                 break;
             }
         }
     }
     
 
     
     private void OnTriggerEnter(Collider other)
     {
         if (other.tag.Equals("Obstacles"))
             er.isGameOver = true;
             er.maxpoints += (int) er.time;
     }
 }