Doodle Jump-like open level edges

Ahoi!

So I´m currently working on a vertical platformer and I wondered how to create those "open" level edges like Doodle Jump, Mega Jump etc.

The main problem is I don´t know the specific naming of that feature so if anybody could give me a hint on where to find it and how to get more info about I´d be grateful :)

I´m using the "Corgi Engine" to do this. In case anybody reading this has been wroking with it already. It has a "Level Border" Script which appears to be the closest solution to me so I just leave the script here for now. Sorry, 99% artist, 1% programmer speaking here :P

 using UnityEngine;
 using System.Collections;
 /// <summary>
 /// Add this class to a boxcollider to signify the bounds of your level
 /// </summary>
 public class LevelLimits : MonoBehaviour 
 {
     /// left x coordinate
     public float LeftLimit;
     /// right x coordinate
     public float RightLimit;
     /// bottom y coordinate 
     public float BottomLimit;
     /// top y coordinate
     public float TopLimit;
     private BoxCollider2D _collider;
     
     /// <summary>
     /// On awake, fills the public variables with the level's limits
     /// </summary>
     void Awake () 
     {
         _collider=GetComponent<BoxCollider2D>();
         
         LeftLimit=_collider.bounds.min.x;
         RightLimit=_collider.bounds.max.x;
         BottomLimit=_collider.bounds.min.y;
         TopLimit=_collider.bounds.max.y;        
     }    
 }