2d Mobile game physics gravity not working

Hello,

I am making a simple EASY and yes trying to make it easy 2d mobile android game for fun/test, but i got the run right and left working with button, but jumping, doesnt work, i looked at all tutorials online, youtube etc., they point to the same way or similiar way of jumping:

rb.velocity = new Vector2(rb.velocity.x, rb.velocity.y * jumpForce);

HOWEVER, my character never jumps, i even checked the gravity, i put debug.log() to test if the button is pressed, jump, YUP that works, however the character never jumps, i used brackeys, and other tutorials to help me get this working, but NOTHING!!! i am at my wits end with unity… i am willing to share my entire project to help assist on finding out what am i doing wrong 🙁 any help, suggestions etc… i will copy and paste the code, but i believe if i share my project, it will bring more light to the problem, please give me email if interested so i can email you the entire project, its about 79 mb zipped file.

below is the CharacterControls.cs i have attached to the character object to jump, i have rigidbody2d already set and collider, plus the GameObject that is invisible set as well to see if it has touched the ground. and yes i set that layer as well.

please… again i am at my wits end and wondering if unity is even good to make mobile games or should i try coco or godot for mobile games?

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityStandardAssets.CrossPlatformInput;
public class CharacterControl : MonoBehaviour
{
float dirX;
public float moveSpeed = 10f;
Rigidbody2D rb;
bool facingRight = true;
Vector3 localScale;
public Animator animator;
private bool isGrounded = false;
public Transform groundCheck;
public float groundCheckRadius;
public LayerMask whatIsGround;
private bool jump = false;
public float jumpForce;
// Use this for initialization
void Start ()
{
localScale = transform.localScale;
rb = GetComponent<Rigidbody2D> ();
}
// Update is called once per frame
void Update()
{
dirX = CrossPlatformInputManager.GetAxis ("Horizontal");
isGrounded = Physics2D.OverlapCircle(groundCheck.position, groundCheckRadius, whatIsGround);
if(isGrounded && jump == true)
{
//rb.velocity = Vector2.up * jumpForce;
rb.velocity = new Vector2(rb.velocity.x, rb.velocity.y * jumpForce);
}
}
void FixedUpdate()
{
rb.velocity = new Vector2 (dirX * moveSpeed, 0);
if (rb.velocity.magnitude > 0)
{
animator.SetBool("Run", true);
}
else
animator.SetBool("Run", false);
}
void LateUpdate()
{ 
CheckWhereToFace ();
}
public void JumpCheck(bool checkjump)
{
if (checkjump == true)
{
jump = true;
}
}
void CheckWhereToFace ()
{
if (dirX > 0)
facingRight = true;
else if (dirX < 0)
facingRight = false;
if (((facingRight) && (localScale.x < 0)) || ((!facingRight) && (localScale.x > 0)))
{
localScale.x *= -1;
}
transform.localScale = localScale;
}
}