Unity de sashimi

AudioManager.cs

using UnityEngine;
using System.Collections;

public class AudioManager : SingletonMonoBehaviour<AudioManager> {

  AudioClip bgm_Game;
  AudioClip se_Tanpopo;

  private const int source_bgm_Game = 0;
  private const int maxAudio = 10;
  private int audioCount = 2;
  AudioSource[] audioSource = new AudioSource[10];

  // Use this for initialization
  void Start () {

  }

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

  }

  void Awake() {
    bgm_Game = Resources.Load ("Audio/game", typeof(AudioClip)) as AudioClip;
    se_Tanpopo = Resources.Load ("Audio/tanpopo", typeof(AudioClip)) as AudioClip;

    for (int i = 0; i < maxAudio; i++) {
      audioSource[i] = gameObject.AddComponent<AudioSource>();
      audioSource[i].dopplerLevel = 0;
    }

    GameObject.DontDestroyOnLoad(this.gameObject);
  }

  public void PlayBgm() {
    if (!audioSource[source_bgm_Game].isPlaying) {
      audioSource[source_bgm_Game].volume = 1.0f;
      audioSource[source_bgm_Game].clip = bgm_Game;
      audioSource[source_bgm_Game].loop = true;
      audioSource[source_bgm_Game].Play();
    }
  }

  public void PauseBgm() {
    if (audioSource[source_bgm_Game].isPlaying) {
      audioSource[source_bgm_Game].Pause();
    }
  }

  public void StopBgm() {
    if (audioSource[source_bgm_Game].isPlaying) {
      audioSource[source_bgm_Game].Stop();
    }
  }

  public void PlayTanpopo() {
    PlaySound(se_Tanpopo);
  }

  private void PlaySound(AudioClip audioClip) {
    audioSource[audioCount].volume = 1.0f;
    audioSource[audioCount].clip = audioClip;
    audioSource[audioCount].Play();
    addAudioCount();
  }

  private void addAudioCount() {
    audioCount++;
    if (audioCount >= maxAudio) {
      audioCount = 2;
    }
  }
}

Circle.cs

using UnityEngine;
using System.Collections;

public class Circle : MonoBehaviour {

  // Use this for initialization
  void Start () {

  }

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

  }

  // 当たり判定のある間実行される
  void OnTriggerStay2D (Collider2D coll) {
    if (coll.gameObject.tag == "Sashimi") {
      Sashimi sashimi = coll.gameObject.GetComponent<Sashimi>();
      if (Input.GetMouseButtonDown(0)) {
        sashimi.TanpopoGot();
      }
    }
  }
}

GameController.cs

using UnityEngine;
using System.Collections;

public class GameController : MonoBehaviour {
  public AudioManager sm;
  private GameObject pauseText;
  private bool pause = false;

  // Use this for initialization
  void Start () {
    // BGMの再生
    GameObject go = GameObject.FindGameObjectWithTag("AudioManager");
    if (go == null) {
      go = GameObject.Instantiate(Resources.Load("Prefab/AudioManager", typeof(GameObject))) as GameObject;
    }
    sm = go.GetComponent<AudioManager> ();
    sm.PlayBgm ();

    // ゲームオブジェクトの生成
    GameObject.Instantiate(Resources.Load("Prefab/ScorePrefab", typeof(GameObject)));
    GameObject.Instantiate(Resources.Load("Prefab/CirclePrefab", typeof(GameObject)));
    GameObject.Instantiate(Resources.Load("Prefab/ShooterPrefab", typeof(GameObject)));
  }

  // Update is called once per frame
  void Update () {
    if (Input.GetKeyDown(KeyCode.Escape)) {
      if (this.pause) {
        if (this.pauseText) {
          Destroy(this.pauseText);
          this.pauseText = null;
        }
        Time.timeScale = 1;
        this.pause = false;
        sm.PlayBgm ();
      } else {
        this.pauseText = GameObject.Instantiate(Resources.Load("Prefab/PauseTextPrefab", typeof(GameObject))) as GameObject;
        Time.timeScale = 0;
        this.pause = true;
        sm.PauseBgm ();
      }
    }
  }
}

Sashimi.cs

using UnityEngine;
using System.Collections;

public class Sashimi : MonoBehaviour {

  public float velocity;
  public bool isDone = false; // ヒット判定用

  private SpriteRenderer myRenderer;
  private Score score;
  private GameController gameController;

  public Sprite tanpopoSprite;

  // Use this for initialization
  void Start () {
    GameObject sgo = GameObject.FindGameObjectWithTag("Score");
    this.score = sgo.GetComponent<Score>();

    GameObject ggo = GameObject.FindGameObjectWithTag("GameController");
    this.gameController = ggo.GetComponent<GameController>();

    this.rigidbody2D.AddForce(-Vector2.right * velocity);
    this.myRenderer = gameObject.GetComponent<SpriteRenderer>();
  }

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

  }

  void OnBecameInvisible() {
    if (!this.isDone) this.score.RemoveScore();
    Destroy(this.gameObject);
  }

  public void TanpopoGot() {
    if (!this.isDone) {
      Debug.Log("[Sashimi] たんぽぽが添えられた");
      this.gameController.sm.PlayTanpopo();
      this.score.AddScore();
      this.isDone = true;
      this.myRenderer.sprite = tanpopoSprite;
    } else {
      Debug.Log("[Sashimi] すでにたんぽぽが添えられている");
    }
  }
}

Shooter.cs

using UnityEngine;
using System.Collections;

public class Shooter : MonoBehaviour {

  public GameObject sashimiPrefab;

  private float timer = 0.0f;
  private float interval = 1.0f;
  private float intervalTimer = 0.0f;

  void Start () {
    timer = 0.0f;
    intervalTimer = 0.0f;
  }

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

  void createSashimiPrefab() {
    timer -= Time.deltaTime;
    if (timer < interval) {
      Instantiate(this.sashimiPrefab);
      timer = 0.0f;
      interval = Random.Range(-1, -4);
    }
    intervalTimer += Time.deltaTime;
  }
}