Assets/Scripts/GameManager.cs(24,33): error CS0029: Cannot implicitly convert type `bool' to `int'

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

public class GameManager : MonoBehaviour {

 public int currentScore;
 public int highScore;
 public static int currentLevel = 0;
 public int unlockedLevel;
 public Color warningColorTimer;
 public Color defaultColorTimer;


 public Rect timerRect;
 public GUISkin skin;

 public float startTime;
 private string currentTime;
 
 void Start() {
     //DontDestroyOnLoad(gameObject);
     if(currentLevel = PlayerPrefs.GetInt("Level Completed") > 0) {
         PlayerPrefs.GetInt("Level Completed");
     } else {
         currentLevel = 0;
     }
     
 }

 void Update(){
     startTime -= Time.deltaTime;
     currentTime = string.Format("{0:0.00}", startTime);
     if(startTime <= 0) {
         startTime = 0;
         SceneManager.LoadScene(3);
     }
 }



 public void CompleteLevel() {
     if(currentLevel < 2) {
         currentLevel += 1;
         PlayerPrefs.SetInt("Level Completed", currentLevel);
         PlayerPrefs.SetInt("Level " + currentLevel.ToString() + " score", currentScore);

         SceneManager.LoadScene(currentLevel);
     } else {
         print("You won");
     }
 }

 void OnGUI() {
     GUI.skin = skin;
     if(startTime < 5f) {
         skin.GetStyle("Timer").normal.textColor = warningColorTimer;
     } else {
         skin.GetStyle("Timer").normal.textColor = defaultColorTimer;

     }
     GUI.Label(timerRect, currentTime, skin.GetStyle("Timer"));
 }

}