Player.cs

using UnityEngine;
using System.Collections;

public class Player : MonoBehaviour {



	float speed = 3;
	Camera MainCam;
	// Use this for initialization
	void Start () {
		MainCam = (Camera)GameObject.Find ("Main Camera").GetComponent<Camera> ();
	}
	
	// Update is called once per frame
	void Update () {
		if (Input.GetKey(KeyCode.UpArrow)) {
			transform.Translate(0f,0f,speed * Time.deltaTime);
		}
		else if (Input.GetKey(KeyCode.DownArrow)) {
			transform.Translate(0f,0f,-speed * Time.deltaTime);
		}
		else if (Input.GetKey(KeyCode.RightArrow)) {
			transform.Translate(speed * Time.deltaTime,0f,0f);
		}
		else if (Input.GetKey(KeyCode.LeftArrow)) {
			transform.Translate(-speed * Time.deltaTime,0f,0f);
		}
		float horizontal = 3.0f * Input.GetAxis("Mouse X");
		float vertical = 3.0f * Input.GetAxis("Mouse Y");
		transform.Rotate(0f, horizontal, 0f);
		MainCam.transform.Rotate(-vertical, 0f, 0f);
	}
}