Raycast Problems

using UnityEngine;
using System.Collections;

public class CrossyPlayer : MonoBehaviour {

    float amount = 0.70f;


    //RayCasting things
    float lenghtRayX;
    float lenghtRayY;
    Vector2 origin;

    //CollisionThings
    bool collidingUp = false;
    bool collidingDown = false;
    bool collidingRight = false;
    bool collidingLeft = false;

    // Use this for initialization
    void Start () {
        lenghtRayX = GetComponent<Collider2D>().bounds.extents.x * 2;
        lenghtRayY = GetComponent<Collider2D>().bounds.extents.y * 2;
        origin = transform.position;
    }

    // Update is called once per frame
    void Update () {
        IsCollidingDown();
        IsCollidingUp();
        if ((Input.GetKeyDown("up") || Input.GetKeyDown(KeyCode.W)) && !collidingUp )
        {
            transform.position = new Vector2(transform.position.x, transform.position.y + amount); ;
        }
        if ((Input.GetKeyDown("down") || Input.GetKeyDown(KeyCode.S)) && !collidingDown)
        {
            transform.position = new Vector2(transform.position.x, transform.position.y - amount); ;
        }
        if (Input.GetKeyDown("left") || Input.GetKeyDown(KeyCode.A))
        {
            transform.position = new Vector2(transform.position.x - amount, transform.position.y); ;
        }
        if (Input.GetKeyDown("right") || Input.GetKeyDown(KeyCode.D))
        {
            transform.position = new Vector2(transform.position.x + amount, transform.position.y ); ;
        }
    }


    void IsCollidingUp()
    {
        origin = transform.position;
        Vector2 direction = Vector2.up ;
        Ray2D ray = new Ray2D(origin, direction);
        Debug.DrawRay(ray.origin, ray.direction, Color.yellow);
        RaycastHit2D hit = Physics2D.Raycast(origin, direction);
        if (hit.collider.tag == "Bounds")
        {
            Debug.Log("Collision");
            collidingUp = true;
        }

        collidingUp = false;
    }

    void IsCollidingDown()
    {
        origin = transform.position;
        Vector2 direction = Vector2.down;
        Ray2D ray = new Ray2D(origin, direction);
        Debug.DrawRay(origin, direction, Color.yellow);
        RaycastHit2D hit = Physics2D.Raycast(origin,direction);
        if (hit.collider.tag == "Bounds")
        {
            Debug.Log("Collision");
            collidingDown = true;
        }

        collidingDown = false;
    }

}