Modified Unity Tutorial scripts including: A camera controller script for Unity Roll-a-ball that lets you rotate the camera, a wall mover, and the player controller to go with them

CameraController_with_Rotation.cs

using UnityEngine;
using System.Collections;

public class CameraController : MonoBehaviour {

	public GameObject player;
    public static int rotPosition = 0;

	private Vector3 offset;
    private bool rotating = false;

    //adding new stuff from: https://answers.unity.com/questions/655896/rotating-a-camera-90-degrees-around-an-object.html

    private float targetAngle = 0;
    const float rotationAmount = 10.0f;

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

        // Trigger functions if Rotate is requested
        if (Input.GetKeyDown("z"))
        {
            targetAngle -= 90.0f;
        } else if (Input.GetKeyDown("x")) {
            targetAngle += 90.0f;
        }

        if(targetAngle !=0)
        {
            rotating = true;
            Rotate();
        }
    }

    protected void Rotate()
    {

        if (targetAngle>0)
        {
            transform.RotateAround(player.transform.position, Vector3.up, -rotationAmount);
            targetAngle -= rotationAmount;
        }
        else if(targetAngle <0)
        {
            transform.RotateAround(player.transform.position, Vector3.up, rotationAmount);
            targetAngle += rotationAmount;
        }

        if (targetAngle == 0)
        {
            rotating = false;
        }

    }

    //end of modified new stuff


	// Use this for initialization
	void Start () 
    {
		offset = transform.position - player.transform.position;
	}

	// Update is called once per frame
	void LateUpdate () 
    {
		if (Input.GetKeyDown ("z")) 
        {
            rotPosition++;
            if (rotPosition > 3)
                rotPosition = 0;
		} 
        else if (Input.GetKeyDown ("x")) 
        {
            rotPosition--;
            if (rotPosition < 0)
                rotPosition = 3;
		}

		switch (rotPosition)
		{
			case 0:
                offset = new Vector3(0, 7, -10);
				break;
			
			case 1:
                offset = new Vector3(-10, 7, 0);
				break;

			case 2:
                offset = new Vector3(0, 7, 10);
				break;

			case 3: 
                offset = new Vector3(10, 7, 0);
				break;
		}

        if (rotating == false)
        {
            transform.position = player.transform.position + offset;
        }
	}
}

MoveWall.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class MoveWall : MonoBehaviour {

	public Rigidbody rb;
	public float moveAmount;

	// Use this for initialization
	void Start () {
		rb = GetComponent<Rigidbody> ();
	}
	
	// Update is called once per frame
	void Update () {
		rb.position = new Vector3(rb.position.x, rb.position.y + moveAmount, rb.position.z); 

		if (rb.position.y > 2 || rb.position.y < -2)
			moveAmount *= -1;
	}
}

PlayerController_with_Rotation.cs

using UnityEngine;
using UnityEngine.UI;
using System.Collections;

public class PlayerController : MonoBehaviour {

	public float speed;
	public int numCubes;
	public Text countText;
	public Text winText;
	public Text oopsText;

	private Rigidbody rb;
	private int count;
	private ArrayList collected = new ArrayList(); //
	private bool jumped;

	void Start() 
	{
		rb = GetComponent<Rigidbody>();
		count = 0;
		SetCountText();
		winText.text = "";
		oopsText.text = "";
	}

	void FixedUpdate () 
	{
		float moveHorizontal = Input.GetAxis("Horizontal");  //x
		float moveVertical = Input.GetAxis("Vertical"); //y
        Vector3 movement = new Vector3();

        int rotationSwitch = CameraController.rotPosition;

        switch (rotationSwitch)
        {
            
            case 0:
		        movement = new Vector3(moveHorizontal, 0.0f, moveVertical);
                break;
            
            case 1:
                movement = new Vector3(moveVertical, 0.0f, -1 * moveHorizontal);
                break;

            case 2:
                movement = new Vector3(moveHorizontal * -1, 0.0f, moveVertical * -1);
                break;

            case 3: 
                movement = new Vector3(moveVertical * -1, 0.0f, moveHorizontal);
                break;
        }

		rb.AddForce(movement * speed);

		if (this.transform.position.y <= -20)
		{
			this.transform.position = new Vector3 (0, 5, 0);
			count = 0;
			foreach (Collider thing in collected) {
				thing.gameObject.SetActive(true);
			}
			collected = new ArrayList();
			SetCountText ();
			oopsText.text = "Oops! Try Again!";
			winText.text = "";
		}
		if(Input.GetKeyDown("space") && !jumped)
		{
			Vector3 bounce = new Vector3 (0.0f, speed * 20, 0.0f);
			rb.AddForce(bounce);
			jumped = true;
		}
	}

	void OnTriggerEnter(Collider other) 
	{
		if (other.gameObject.CompareTag("Pick Up"))
		{
			other.gameObject.SetActive(false);
			count++;
			SetCountText();
			collected.Add (other); 
		}
		oopsText.text = "";
	}

	void SetCountText ()
	{
		countText.text = "Count: " + count.ToString ();
		if (count >= numCubes) 
		{
			winText.text = "You have won!";
		}
	}

	void OnCollisionStay()
	{
		jumped = false;
	}
}