/**** 
* Classes
****/ 
// Enemy class
var Enemy = Container.expand(function () {
	var self = Container.call(this);
	var enemyGraphics = self.attachAsset('enemy', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 5;
	self.update = function () {
		self.y += self.speed;
		if (self.y > 2732) {
			self.destroy();
		}
	};
});
//<Assets used in the game will automatically appear here>
//<Write imports for supported plugins here>
// Hero class
var Hero = Container.expand(function () {
	var self = Container.call(this);
	var heroGraphics = self.attachAsset('hero', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 10;
	self.shoot = function () {
		var bullet = new HeroBullet();
		bullet.x = self.x;
		bullet.y = self.y - heroGraphics.height / 2;
		game.addChild(bullet);
		heroBullets.push(bullet);
	};
});
// HeroBullet class
var HeroBullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.attachAsset('heroBullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = -10;
	self.update = function () {
		self.y += self.speed;
		if (self.y < 0) {
			self.destroy();
		}
	};
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x000000 //Init game with black background
});

/**** 
* Game Code
****/ 
var background = game.attachAsset('background', {
	anchorX: 0.0,
	anchorY: 0.0
});
// Initialize variables
var hero;
var enemies = [];
var heroBullets = [];
var score = 0;
var health = 5; // Initialize hero's health to 5
var scoreTxt = new Text2('0', {
	size: 150,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Create hero
hero = game.addChild(new Hero());
hero.x = 2048 / 2;
hero.y = 2732 - 200;
// Create health text field
var healthTxt = new Text2('Health: 5', {
	size: 150,
	fill: 0xFFFFFF
});
healthTxt.anchor.set(0.5, 0);
LK.gui.topRight.addChild(healthTxt);
// Handle game events
game.down = function (x, y, obj) {
	hero.x = x;
};
game.move = function (x, y, obj) {
	hero.x = x;
};
game.update = function () {
	// Update hero bullets
	for (var i = heroBullets.length - 1; i >= 0; i--) {
		heroBullets[i].update();
		for (var j = enemies.length - 1; j >= 0; j--) {
			if (heroBullets[i].intersects(enemies[j]) && enemies[j].y > 0) {
				enemies[j].destroy();
				heroBullets[i].destroy();
				enemies.splice(j, 1);
				heroBullets.splice(i, 1);
				score++;
				scoreTxt.setText(score);
				break;
			}
		}
	}
	// Update enemies
	for (var k = enemies.length - 1; k >= 0; k--) {
		enemies[k].update();
		if (enemies[k].intersects(hero)) {
			LK.effects.flashScreen(0xff0000, 1000);
			LK.showGameOver();
		}
		// Decrease hero's health when an enemy passes by
		if (enemies[k].y > 2732) {
			health--;
			healthTxt.setText('Health: ' + health);
			// End the game if the hero's health reaches 0
			if (health <= 0) {
				LK.effects.flashScreen(0xff0000, 1000);
				LK.showGameOver();
			}
		}
	}
	// Spawn enemies
	if (LK.ticks % 60 == 0) {
		var enemy = new Enemy();
		enemy.x = Math.random() * 2048;
		enemy.y = -50;
		game.addChild(enemy);
		enemies.push(enemy);
	}
	// Hero shooting
	if (LK.ticks % 60 == 0) {
		hero.shoot();
	}
};

===================================================================
--- original.js
+++ change.js
@@ -68,8 +68,9 @@
 var hero;
 var enemies = [];
 var heroBullets = [];
 var score = 0;
+var health = 5; // Initialize hero's health to 5
 var scoreTxt = new Text2('0', {
 	size: 150,
 	fill: 0xFFFFFF
 });
@@ -78,8 +79,15 @@
 // Create hero
 hero = game.addChild(new Hero());
 hero.x = 2048 / 2;
 hero.y = 2732 - 200;
+// Create health text field
+var healthTxt = new Text2('Health: 5', {
+	size: 150,
+	fill: 0xFFFFFF
+});
+healthTxt.anchor.set(0.5, 0);
+LK.gui.topRight.addChild(healthTxt);
 // Handle game events
 game.down = function (x, y, obj) {
 	hero.x = x;
 };
@@ -108,8 +116,18 @@
 		if (enemies[k].intersects(hero)) {
 			LK.effects.flashScreen(0xff0000, 1000);
 			LK.showGameOver();
 		}
+		// Decrease hero's health when an enemy passes by
+		if (enemies[k].y > 2732) {
+			health--;
+			healthTxt.setText('Health: ' + health);
+			// End the game if the hero's health reaches 0
+			if (health <= 0) {
+				LK.effects.flashScreen(0xff0000, 1000);
+				LK.showGameOver();
+			}
+		}
 	}
 	// Spawn enemies
 	if (LK.ticks % 60 == 0) {
 		var enemy = new Enemy();