Added quick game timer

Assets/Prefabs/UI Canvas.prefab

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Assets/Scenes/JasonScene.unity

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Assets/Scripts/GameFlowManager.cs

@@ -1,9 +1,12 @@
+using NaughtyAttributes;
 using UnityEngine;
 using UnityEngine.InputSystem;
 using UnityEngine.SceneManagement;
 
 //Could be a singleton
 public class GameFlowManager : MonoBehaviour {
+	[SerializeField] [Required]
+	GameTimer gameTimer = null!;
 	/// <summary>
 	/// True if time is frozen (Start, Pause Menu, Dead)
 	/// </summary>
@@ -80,8 +83,16 @@ public class GameFlowManager : MonoBehaviour {
 		
 		public override void EnterState() {
 			base.EnterState();
+			
+			gameFlowManager.gameTimer.StartTimer();
 			gameFlowManager.SetPause(false);
 		}
+
+		public override void LeaveState() {
+			base.LeaveState();
+			
+			gameFlowManager.gameTimer.PauseTimer();
+		}
 	}
 	class PauseMenuFlowState : GameFlowState {
 		public PauseMenuFlowState(GameFlowManager gameFlowManager) : base(gameFlowManager) {}

Assets/Scripts/GameTimer.cs

@@ -0,0 +1,30 @@
+using System;
+using TMPro;
+using UnityEngine;
+
+public class GameTimer : MonoBehaviour {
+	TMP_Text label;
+	float timer;
+	bool stopped;
+
+	void Awake() {
+		label = GetComponent<TMP_Text>();
+		stopped = true;
+	}
+
+	public void StartTimer() {
+		timer = Time.time;
+		stopped = false;
+	}
+
+	public void PauseTimer() => stopped = true;
+
+	void Update() {
+		if (stopped)
+			return;
+
+		timer += Time.deltaTime;
+		label.text = TimeSpan.FromSeconds(timer)
+			.ToString(@"mm\:ss");
+	}
+}

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