uniRxを使ったトマト集めゲームのスクリプト（http://bibinbaleo.hatenablog.com/entry/2019/07/03/212152）

game_manager.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using UniRx;
using System;
using UnityEngine.SceneManagement;
using UniRx.Triggers;

public class game_manager : MonoBehaviour
{
    public Text timeText;
    public Text pointText;
    public Text endText;
    public Button startButton;
    public int nowTime = 15;
    public float totalTime = 15f;
    public float tomatoFrequently = 0.4f;
    public AudioSource eatSound;
    public GameObject tomato;
    public GameObject EndPanel;
    public GameObject textUI;

    private float timeleft = 1.0f;
    private bool isGameStart = false;
    private int point = 0;

    // Start is called before the first frame update
    void Start()
    {
        pointText.text = point + "点";
        textUI.SetActive(false);
        EndPanel.SetActive(false);
        isGameStart = true;
        tomatoDestroy.OnEat.Subscribe(_ => { Eat(); }).AddTo(this);
        var disposable = new SingleAssignmentDisposable();
        

        startButton.onClick.AsObservable().Subscribe((_) => {
            textUI.SetActive(true);
            disposable.Disposable = this.UpdateAsObservable().Subscribe(x =>
            {
                TomatoMake();
                Timer();
                if (isGameStart == false)
                {
                    disposable.Dispose();
                }
            });
        });
       
    }

    private void Eat()
    {
        eatSound.Play();
        point++;
        pointText.text = point + "点";

    }
    private void Timer()
    {
        if (nowTime > 0)
        {
            totalTime -= Time.deltaTime;
            nowTime = (int)totalTime;
            timeText.text = nowTime.ToString();
        }
        else if (nowTime == 0)
        {
            GameEnd();
        }
    }

    private void TomatoMake()
    {

        timeleft -= Time.deltaTime;
        if (timeleft <= 0.0)
        {
            timeleft = tomatoFrequently;
            Vector2 pos = new Vector2(UnityEngine.Random.Range(-3.0f, 3.0f), 4f);
            Instantiate(tomato, pos, Quaternion.identity);
        }
    }

    public void GameRestart()
    {
        SceneManager.LoadScene("MainScene");
    }
    private void GameEnd()
    {
        isGameStart = false;
        EndPanel.SetActive(true);
        endText.text = point + "点";
        textUI.SetActive(false);
       
    }
}

packman.cs

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

public class packman : MonoBehaviour
{

    public GameObject tomato;
    Vector3 player_pos;
    public float moving_distance=0.1f;
    // Start is called before the first frame update
    void Start()
    {

    }

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

    private void PackmanMove()
    {
        player_pos = transform.position; //プレイヤーの位置を取得

        player_pos.x = Mathf.Clamp(player_pos.x, -3f, 3f); //x位置が常に範囲内か監視
        if (Input.GetKey(KeyCode.LeftArrow))
        {
            player_pos.x = player_pos.x - moving_distance;
        }
        if (Input.GetKey(KeyCode.RightArrow))
        {
            player_pos.x = player_pos.x + moving_distance;
        }
        transform.position = new Vector2(player_pos.x, player_pos.y);
    }
}

tomatoDestroy.cs

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

public class tomatoDestroy : MonoBehaviour
{
    private static Subject<Unit> m_OnEat = new Subject<Unit>();
    public static IObservable<Unit> OnEat { get { return m_OnEat; } }

    // Start is called before the first frame update
    void Start()
    {

    }

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

        if (!GetComponent<Renderer>().isVisible)
        {
            Destroy(this.gameObject);
        }
    }

    void OnTriggerEnter2D(Collider2D other)
    {
        if (other.tag == "Player")
        {
            Destroy(this.gameObject);
        }
        m_OnEat.OnNext(Unit.Default);
    }
}