PlayerController

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class PlayerController : MonoBehaviour
{

    private Rigidbody2D rb;
    public float speed;
    public Vector2 jumpHeight;
    public bool isGrounded;

    // Use this for initialization
    void Start()
    {
        rb = GetComponent<Rigidbody2D>();
        isGrounded = false;
    }

    // Update is called once per frame
    void FixedUpdate()
    {
        float moveHorizontal = Input.GetAxis("Horizontal");
        Vector2 movement = new Vector2(moveHorizontal, 0);
        rb.AddForce(movement * speed);
        if (Input.GetKeyDown(KeyCode.Space) && isGrounded)
        {
            rb.AddForce(jumpHeight, ForceMode2D.Impulse);
            isGrounded = false;
        }


    }

    private void OnCollisionEnter2D(Collision2D collision)
    {
        if(collision.gameObject.tag == "Ground")
        {
            isGrounded = true;
        }
    }
}