2D Platformer: How to stop my character from auto-sliding?

Long story short, I am making a 2D platformer, and I have came across an error that I can't seem to find a solution too, no matter where I look. My character will automatically slide down ramps (all of which are at a 45 degree angle, if that means anything), and going up them is a bit slower than normally walking on flat ground. I just want to know how to make it so they won't slide. Here is my entire Player script, so you can see what I currently have for movement, so on and so forth:

 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;
         }
     }
 }

Alternate link to the code: http://pastebin.com/Rz8Eiq8a

If you need more information to assist, please contact me or reply to this post and I will provide your requested info.

EDIT: Bumped this multiple times now, received no answers. If literally ANYONE has an idea, please tell me. This issue is really starting to get on my nerves. -.-