My Player Script

using UnityEngine;
using System.Collections;
using UnityEngine.SceneManagement;

public class Player : MonoBehaviour {

    //Floats
    public float maxSpeed = 3;
    public float speed = 50f;
    public float jumpPower = 200f;

    //Booleans
    public bool grounded;
    public bool canDoubleJump;
    public bool facingRight = true;

    //Stats
    public int curHealth;
    public int maxHealth = 5;

    //References
    private Rigidbody2D rb2d;
    private Animator anim;
    private GameMaster gm;

    void Start () {
        rb2d = gameObject.GetComponent<Rigidbody2D> ();
        anim = gameObject.GetComponent<Animator> ();

        curHealth = maxHealth;

        gm = GameObject.FindGameObjectWithTag ("GameMaster").GetComponent<GameMaster> ();
    }

    void Update () {
        anim.SetBool ("Grounded", grounded);
        anim.SetFloat ("Speed", Mathf.Abs(rb2d.velocity.x));

        //Movement
        if (Input.GetAxis ("Horizontal") < -0.1f) {
            transform.localScale = new Vector3 (-1, 1, 1);
            facingRight = false;
        }
        if (Input.GetAxis ("Horizontal") > 0.1f) {
            transform.localScale = new Vector3 (1, 1, 1);
            facingRight = true;
        }
        if (Input.GetButtonDown ("Jump")) {
            if (grounded) {
                rb2d.AddForce (Vector2.up * jumpPower);
                canDoubleJump = true;
            } else if (canDoubleJump) {
                canDoubleJump = false;
                rb2d.velocity = new Vector2 (rb2d.velocity.x, 0);
                rb2d.AddForce (Vector2.up * jumpPower);
            }
        }

        //Death
        if (curHealth > maxHealth) {
            curHealth = maxHealth;
        } else if (curHealth <= 0) {
            curHealth = 0;
            Die ();
        }
    }

    void FixedUpdate() {
        // Fake friction / easing the X speed of the player
        Vector3 easeVelocity = rb2d.velocity;
        easeVelocity.y = rb2d.velocity.y;
        easeVelocity.z = 0.0f;
        easeVelocity.x *= 0.75f;
        if (grounded) {
            rb2d.velocity = easeVelocity;
        }

        // Moving the player
        float h = Input.GetAxis ("Horizontal");
        if (grounded) {
            rb2d.AddForce ((Vector2.right * speed) * h);
        } else {
            rb2d.AddForce ((Vector2.right * speed / 2) * h);
        }

        // Limit speed of the player
        if (rb2d.velocity.x > maxSpeed) {
            rb2d.velocity = new Vector2(maxSpeed, rb2d.velocity.y);
        }
        if (rb2d.velocity.x < -maxSpeed) {
            rb2d.velocity = new Vector2(-maxSpeed, rb2d.velocity.y);
        }
    }

    // All the functions that deal with getting hurt.
    void Die() {
        SceneManager.LoadScene (SceneManager.GetActiveScene().name);
    }
    public void Damage(int dmg) {
        curHealth -= dmg;
        gameObject.GetComponent<Animation> ().Play ("Hurt");
    }
    public IEnumerator Knockback(float knockDur, float knockPwr, Vector3 knockDir) {
        float timer = 0;

        while (knockDur > timer) {
            timer += Time.deltaTime;
            rb2d.velocity = new Vector2 (0, 0);
            rb2d.AddForce (new Vector3 (knockDir.x * -100, knockDir.y + knockPwr, transform.position.z)); // X: Opposite direction, Y: Knocked up depending on how powerful the knockback is, Z: No change.
        }
        yield return 0;
    }

    // Handles picking up Coins and Hearts
    void OnTriggerEnter2D(Collider2D col) {
        if (col.CompareTag ("Coin")) {
            Destroy (col.gameObject);
            gm.score += 1;
        } else if (col.CompareTag ("Heart") && curHealth < maxHealth) {
            Destroy (col.gameObject);
            curHealth += 1;
        }
    }
}