Chip's Tunes - Activators.cs

using UnityEngine;
using System.Collections;

public class Activators : MonoBehaviour {

    public KeyCode Key;
    bool Active;
    GameObject Note, GM;
    SpriteRenderer SR;
    Color OldColor;
    public bool CreateMode;
    public GameObject BasicNote;
    public ParticleSystem Hit;
    public AudioSource Failure, Miss;
    public bool Inv = true;

    void Start () {
        GM = GameObject.Find ("GameManager");
        SR = GetComponent<SpriteRenderer> ();
        OldColor = SR.color;
    }

    void Update () {
        //Creating a song by hand
        if (CreateMode) {
            if (Input.GetKeyDown (Key))
                Instantiate (BasicNote, transform.position, Quaternion.identity);
        } else {
            //Invincibility at the start of a song
            if (Input.GetKeyDown (Key)) {
                StartCoroutine (pressed ());
                if (Inv == true) {
                    Miss.Play ();
                }
            }
            //Hitting a note
            if (Input.GetKeyDown (Key) && Active) {
                Destroy (Note);
                GM.GetComponent<gamemanager> ().addstreak ();
                addscore ();
                Active = false;
                explode ();
            }
            //Miss a note
            else if (Input.GetKeyDown (Key) && !Active && Inv == false) {
                Miss.Play ();
                if (GM.GetComponent<gamemanager>().streak > 25) {
                    Failure.Play ();
                }
                GM.GetComponent<gamemanager> ().resetstreak ();
            }
        }
    }
    void OnTriggerStay2D(Collider2D col) {
        //Player wins
        if (col.gameObject.tag == "WinNote") {
            GM.GetComponent<gamemanager> ().Win ();
        }
        //Assigning the current note
        if (col.gameObject.tag == "Note") {
            Note = col.gameObject;
            Active = true;
        }
        //Turning off invincibility
        if (col.gameObject.tag == "Inv") {
            Inv = false;
        }
}
    void OnTriggerExit2D(Collider2D col) {
        //If the player misses a note
        GM.GetComponent<gamemanager> ().missnote ();
        Active = false;
        GM.GetComponent<gamemanager> ().resetstreak ();
    }

    void addscore () {
        //Calculate total score
        PlayerPrefs.SetInt ("Score", PlayerPrefs.GetInt ("Score") + GM.GetComponent<gamemanager> ().getscore ());
    }
    void explode () {
        //Particle effect when key is pressed
        ParticleSystem explode = Instantiate (Hit) as ParticleSystem;
        explode.transform.position = transform.position;
        explode.Play ();
    }


    IEnumerator pressed () {
        //Changes activator color when key is pressed
        SR.color = new Color (0, 0, 0);
        yield return new WaitForSeconds (0.2f);
        SR.color = OldColor;
    }
}