Jump Code in my flappy bird game

using System.Collections;

using System.Collections.Generic;

using UnityEngine;

public class Jump : MonoBehaviour

{

    public float jumpspeed;

    Rigidbody2D rb;

    // Start is called before the first frame update

    void Start()

    {

        rb = GetComponent<Rigidbody2D>();

    }

    // Update is called once per frame

    void Update()

    {

        if(Input.GetMouseButtonDown(0))

        {

            rb.velocity = Vector2.up*jumpspeed;

        }

    }

}