Unity SmoothCamera2D-Doodle-Jump-Style

using UnityEngine;
using System.Collections;

public class SmoothCamera2D : MonoBehaviour {

    public float dampTime = 0.15f;
    private Vector3 velocity = Vector3.zero;
    public Transform target;
    private Transform TargetOld;
    private Vector3 InitPos;

    void Start(){
        TargetOld = target;
        InitPos = gameObject.transform.position;
    }
    void Update ()
    {
        if (target)
        {
            if(target.transform.position.y > gameObject.transform.position.y){
                Vector3 point = camera.WorldToViewportPoint(target.position);
                Vector3 delta = target.position - camera.ViewportToWorldPoint(new Vector3(0.5f, 0.5f, point.z)); //(new Vector3(0.5, 0.5, point.z));
                Vector3 destination = transform.position + delta;

                destination = new Vector3(InitPos.x,destination.y,InitPos.z) ;
                transform.position = Vector3.SmoothDamp(transform.position, destination, ref velocity, dampTime);
                //transform.position = new Vector3(transform.position.x,transform.position.y,transform.position.z);



            }
        }

    }
}