Build a site first Then create a cube to adjust the angle Bind script to spin him

	void Start () {
		
	}
	
	// Update is called once per frame
	void Update () {
		transform.Rotate(new Vector3(15, 30, 45) * Time.deltaTime);
	}
}

Save it as a prefab

Create a sphere as the control object Set up a script to bind to the sphere so we can control it

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
	public class Playercontraler : MonoBehaviour {
		public float speed=1f;
		private Rigidbody rb;
	    public Text countText;
	    public Text winText;
	    private int count = 0;
// Use this for initialization
	void Start () {
		rb = GetComponent<Rigidbody>();
	    winText.text = " ";
	    SetCountText();
	}
	void SetCountText()
	{
	    countText.text = "count:" + count.ToString();
	    	if (count>=12)
    		{
	    	    	winText.text = "You Win";
    		}
	}
	private void FixedUpdate()
	{
    	float moveHorizontal = Input.GetAxis("Horizontal");
    	float moveVertical = Input.GetAxis("Vertical");
    	Vector3 movement = new Vector3(moveHorizontal, 0, moveVertical);
    	rb.AddForce(movement * speed);
	}
	private void OnTriggerEnter(Collider other)
	{
    	if(other.gameObject.CompareTag("Pickup"))
    		{
        		other.gameObject.SetActive(false);
        		count += 1;
    		}
	}
// Update is called once per frame
void Update ()
{
    SetCountText();
}
}

It can be manipulated, but the angle of the main camera is not perfect Set up a script to bind to the camera so that it follows the sphere And add the code and the prefabrication made before can automatically generate a circle at the beginning of the game

public class Cameracontraller : MonoBehaviour {
public GameObject player;
private Vector3 offset;
public GameObject pickupPFB;
private GameObject[] obj1;
private int objCount = 0;
// Use this for initialization
	void Start () {
		offset = this.transform.position - player.transform.position;
		obj1 = new GameObject[12];
		for(objCount=0;objCount<12;objCount++)
    	{
			obj1[objCount] = GameObject.Instantiate(pickupPFB);
			obj1[objCount].name = "pickup" + objCount.ToString();
			obj1[objCount].transform.position = new Vector3(4 * Mathf.Sin(Mathf.PI / 6 * objCount), 1, 4 * Mathf.Cos(Mathf.PI / 6 * objCount));
       
		}
	}
	private void LateUpdate()
	{
		this.transform.position = player.transform.position + offset;
	}

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