Track play time on the title screen

when's 100% attempts

main/Game.js

@@ -28,6 +28,7 @@ Game = (function() {
 		requestAnimationFrame(gameLoop);
 		
 		Input.refresh();
+		Memory.global.time++;
 		
 		flipScenes();
 		currentScene.ticCount++;

other/Memory.js

@@ -10,6 +10,7 @@ Memory = (function() {
 			
 			global: {
 				keys: [],
+				time: 0,
 			},
 		};
 		

other/Title.js

@@ -117,7 +117,16 @@ Title = function() {
 				"Save 5": "Closure",
 			};
 			
-			menu[2].text = "Slot: " + Memory.slot + " - " + (file ? list[file.lastStage] : "EMPTY");
+			var playtime = "0:00";
+			
+			if (file && file.global.time) {
+				playtime = Math.floor(file.global.time / 3600) + ":"
+					+ (Math.floor(file.global.time / 600) % 10) + ""
+					+ (Math.floor(file.global.time / 60) % 10);
+			}
+			
+			menu[2].text = "Slot: " + Memory.slot + " - " + (file ? list[file.lastStage] : "EMPTY")
+				+ " (" + playtime + ")";
 		}
 	}