2D Movement

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.SceneManagement;
using UnityEngine.UI;

public class Movement : MonoBehaviour {

    public float mySpeed;
    private Rigidbody2D rb;
    private bool facingRight;
    private float health;
    private float maxHealth;

    Animator anim;

    private bool isGrounded;
    public Transform groundCheck;
    float groundRadius = 0.2f;
    public LayerMask stuffThatIsGround;
    public Slider healthBar;


    // Use this for initialization
    void Start () {
        anim = GetComponent<Animator> ();
        rb = GetComponent<Rigidbody2D> ();
        facingRight = true;
        isGrounded = false;
        maxHealth = 10;
        health = maxHealth;
        healthBar.value = CalculateHealth ();
    }

    // Update is called once per frame
    void FixedUpdate () {

        isGrounded = Physics2D.OverlapCircle (groundCheck.position, groundRadius, stuffThatIsGround);
        anim.SetBool ("OnGround", isGrounded);
        float horizontalMovement = Input.GetAxis ("Horizontal");
        anim.SetFloat ("Speed", Mathf.Abs(horizontalMovement));
        rb.velocity = new Vector2 (horizontalMovement * mySpeed, rb.velocity.y);

        if (horizontalMovement > 0 && !facingRight) {
            Flip ();
        } else if (horizontalMovement < 0 && facingRight) {
            Flip ();
        }
        if (isGrounded && Input.GetKeyDown ("space")) {
            rb.AddForce (new Vector2 (0, 5), ForceMode2D.Impulse);
        }
        healthBar.value = CalculateHealth();
    }

    void Flip()
    {
        facingRight = !facingRight;
        Vector3 scale = transform.localScale;
        scale.x *= -1;
        transform.localScale = scale;
    }

    void OnTriggerEnter2D(Collider2D other)
    {
        if (other.gameObject.tag == "Magnet") {
            //health = health - 1;
            health--;
            other.gameObject.SetActive (false);
        }
        if (health == 0) {
            SceneManager.LoadScene ("loser", LoadSceneMode.Single);
        }

    }

    float CalculateHealth()
    {
        return health / maxHealth;
    }
    /*
    void OnCollisionEnter2D(Collision2D other)
    {
        if (other.gameObject.tag == "Magnet") {
            SceneManager.LoadScene ("loser", LoadSceneMode.Single);
        }
    }*/

}