ScoreScript

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

public class ScoreScript : MonoBehaviour
{
	public int score = 0;
	public Text scoreText;
	public Text timerText;

 	// Get gameOver from timer (if not points)
	public bool gameOverByTimer = false;
	public int scoreToGameOver = 10;
	public float timeToGameOver = 10;
	public float timer;

	int scoreThisLevel = 0;

	void Start ()
    {
		score = PlayerPrefs.GetInt("Score");

		// Set timer
		timer = timeToGameOver;
		// Call adjust score without adjusting (0)
		AdjustScore(0);
	}

	void Update()
	{
		// Timer counts down
		timer -= Time.deltaTime;
		timerText.color = Color.yellow;

		if (gameOverByTimer)
			timerText.text = "Timer: " + timer.ToString("F0"); // Update timer text formatted to no decimals
		else
			timerText.text = "Score: " + scoreThisLevel + " out of " + scoreToGameOver;

		// If the timer is 0 load next scene
		if(timer <= 0 && gameOverByTimer)
		{
			LoadNextLevel();
		}
		else if (timer <= 3 && gameOverByTimer)
		{
			timerText.color = Color.red;
		}
		else if (scoreThisLevel >= scoreToGameOver && !gameOverByTimer)
		{
			LoadNextLevel();
		}

		// If pressed Esc
		if(Input.GetKeyDown(KeyCode.Escape))
		{
			// Load current scene (restart)
			SceneManager.LoadScene(SceneManager.GetActiveScene().buildIndex);
		}
	}

	public void LoadNextLevel()
	{
		// Saves score
		PlayerPrefs.SetInt("Score", score);

		// Loads next scene
		SceneManager.LoadScene(SceneManager.GetActiveScene().buildIndex+1);
	}

	public void GameOver()
	{
		PlayerPrefs.SetInt("Score", score);
		SceneManager.LoadScene(SceneManager.sceneCountInBuildSettings-1);
	}

	public void AdjustScore(int adj)
	{
		// Add the adjustment to total score / score this lvl
		score += adj;
		scoreThisLevel += adj;

		// Update score text
		scoreText.text = "Score: " + score;
	}

	void OnApplicationQuit()
	{
		PlayerPrefs.SetInt("Score", 0);
	}
}