public class Move : MonoBehaviour {

    public float speed;

    private Rigidbody2D rb2d;


	// Use this for initialization
	void Start () {

        rb2d = GetComponent<Rigidbody2D>();

	}

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

	}

    void FixedUpdate()
    {
        float moveHorizontal = Input.GetAxis("Horizontal");
        float moveVertical = Input.GetAxis("Vertical");

        Vector2 movement = new Vector2(moveHorizontal, moveVertical);

        rb2d.AddForce(movement * speed);

    }
}