void Start () {
    // Rigidbody2D
    body = GetComponent<Rigidbody2D> ();
}

void Update () {
    // Main Camera
    mainView = Camera.main;

    // Mouse Position
    var mousePosition = mainView.ScreenToWorldPoint (Input.mousePosition);
    Quaternion rotate = Quaternion.LookRotation (transform.position - mousePosition, Vector3.forward);

    // Rotation
    transform.rotation = rotate;
    transform.eulerAngles = new Vector3 (0, 0, transform.eulerAngles.z);

    // Reset Rigidbody2D
    body.velocity = Vector2.zero;
    body.angularVelocity = 0;

    // New Position
    var position = new Vector2 (transform.up.x, transform.up.y) * speed * Time.deltaTime;

    // Mouse Button Down
    if (Input.GetMouseButtonDown (0)) {
        pressed = true;
    }

    // Mouse Button Up
    if (Input.GetMouseButtonUp (0)) {
        pressed = false;
    }

    // Move Player
    if (pressed) {
        body.MovePosition (body.position + position);
    }
}