/**** 
* Plugins
****/ 
var tween = LK.import("@upit/tween.v1");

/**** 
* Classes
****/ 
var Bird = Container.expand(function () {
	var self = Container.call(this);
	var birdGraphics = self.attachAsset('bird', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	var weaponGraphics = self.attachAsset('weapon', {
		anchorX: 0,
		anchorY: 0.5
	});
	weaponGraphics.x = 35;
	weaponGraphics.y = 5;
	self.velocity = 0;
	self.gravity = 0.8;
	self.flapStrength = -15;
	self.health = 500;
	self.maxHealth = 500;
	self.invulnerable = false;
	self.invulnerableTime = 0;
	self.lastShotTime = 0;
	self.flap = function () {
		if (self.health > 0) {
			self.velocity = self.flapStrength;
			LK.getSound('flap').play();
		}
	};
	self.update = function () {
		if (self.health > 0) {
			self.velocity += self.gravity;
			self.y += self.velocity;
			// Rotate bird based on velocity
			birdGraphics.rotation = Math.max(-0.5, Math.min(0.5, self.velocity * 0.05));
			// Handle invulnerability
			if (self.invulnerable) {
				self.invulnerableTime--;
				birdGraphics.alpha = self.invulnerableTime % 10 < 5 ? 0.5 : 1.0;
				if (self.invulnerableTime <= 0) {
					self.invulnerable = false;
					birdGraphics.alpha = 1.0;
				}
			}
			// Auto-shoot at eagles when they get close
			for (var i = 0; i < eagles.length; i++) {
				var eagle = eagles[i];
				var distance = Math.sqrt(Math.pow(eagle.x - self.x, 2) + Math.pow(eagle.y - self.y, 2));
				// If eagle is within 400 pixels and in front of bird, shoot
				if (distance < 400 && eagle.x > self.x) {
					// Check if we haven't shot recently (every 30 frames = 0.5 seconds)
					if (!self.lastShotTime || LK.ticks - self.lastShotTime > 30) {
						self.shoot();
						self.lastShotTime = LK.ticks;
						break; // Only shoot at one eagle per frame
					}
				}
			}
			// Keep bird on screen vertically
			if (self.y < 30) {
				self.y = 30;
				self.velocity = 0;
			}
			if (self.y > 2732 - 30) {
				self.y = 2732 - 30;
				self.velocity = 0;
			}
		}
	};
	self.shoot = function () {
		if (self.health > 0) {
			var newBullet = new Bullet();
			newBullet.x = self.x + 40;
			newBullet.y = self.y;
			bullets.push(newBullet);
			game.addChild(newBullet);
			LK.getSound('shoot').play();
		}
	};
	self.takeDamage = function () {
		if (!self.invulnerable && self.health > 0) {
			self.health -= 25; // Reduce health by 25 points
			if (self.health > 0) {
				self.invulnerable = true;
				self.invulnerableTime = 120; // 2 seconds at 60fps
				LK.effects.flashObject(self, 0xFF0000, 500);
			}
			LK.getSound('hit').play();
			return true;
		}
		return false;
	};
	return self;
});
var Bullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.attachAsset('weapon', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	bulletGraphics.scaleX = 0.5;
	bulletGraphics.scaleY = 0.5;
	bulletGraphics.tint = 0xFFFF00;
	self.speed = 12;
	self.update = function () {
		self.x += self.speed;
	};
	return self;
});
var Coin = Container.expand(function () {
	var self = Container.call(this);
	var coinGraphics = self.attachAsset('coin', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	coinGraphics.tint = 0xFFD700; // Bright golden coins in sky
	self.speed = 4;
	self.collected = false;
	self.update = function () {
		self.x -= self.speed;
		// Simple floating animation
		coinGraphics.y = Math.sin(LK.ticks * 0.1 + self.x * 0.01) * 10;
		coinGraphics.rotation += 0.05;
	};
	return self;
});
var Column = Container.expand(function () {
	var self = Container.call(this);
	self.gapSize = 300;
	self.speed = 4;
	self.scored = false;
	self.init = function (gapY) {
		// Top column
		var topColumn = self.attachAsset('column', {
			anchorX: 0.5,
			anchorY: 1.0
		});
		topColumn.y = gapY - self.gapSize / 2;
		topColumn.tint = 0x4682B4; // Steel blue for sky pillars
		// Bottom column
		var bottomColumn = self.attachAsset('column', {
			anchorX: 0.5,
			anchorY: 0.0
		});
		bottomColumn.y = gapY + self.gapSize / 2;
		bottomColumn.tint = 0x4682B4; // Steel blue for sky pillars
		self.topColumn = topColumn;
		self.bottomColumn = bottomColumn;
	};
	self.initSolid = function () {
		// Create a solid column that spans the entire height
		var solidColumn = self.attachAsset('column', {
			anchorX: 0.5,
			anchorY: 0.5
		});
		solidColumn.y = 2732 / 2; // Center vertically
		solidColumn.height = 2732; // Full screen height
		solidColumn.tint = 0x4682B4; // Steel blue for sky pillars
		self.topColumn = solidColumn;
		self.bottomColumn = null; // No bottom column for solid
	};
	self.update = function () {
		self.x -= self.speed;
	};
	return self;
});
var Diamond = Container.expand(function () {
	var self = Container.call(this);
	var diamondGraphics = self.attachAsset('diamond', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	diamondGraphics.tint = 0x00FFFF; // Cyan diamond color
	self.speed = 4;
	self.collected = false;
	self.update = function () {
		self.x -= self.speed;
		// Sparkle animation
		diamondGraphics.rotation += 0.1;
		diamondGraphics.scaleX = 1.0 + Math.sin(LK.ticks * 0.15) * 0.2;
		diamondGraphics.scaleY = 1.0 + Math.sin(LK.ticks * 0.15) * 0.2;
	};
	return self;
});
var Eagle = Container.expand(function () {
	var self = Container.call(this);
	var eagleGraphics = self.attachAsset('bird', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	eagleGraphics.tint = 0x8B4513; // Brown color for eagle
	eagleGraphics.scaleX = -1.2; // Negative scale to flip horizontally (face left)
	eagleGraphics.scaleY = 1.2;
	self.speed = 6;
	self.update = function () {
		self.x -= self.speed;
		// Track bird position and move towards it
		if (bird && bird.health > 0) {
			var dx = bird.x - self.x;
			var dy = bird.y - self.y;
			var distance = Math.sqrt(dx * dx + dy * dy);
			if (distance > 0) {
				// Move towards bird
				var moveSpeed = 2;
				self.x += dx / distance * moveSpeed;
				self.y += dy / distance * moveSpeed;
			}
		}
		// Simple wing flapping animation
		eagleGraphics.rotation = Math.sin(LK.ticks * 0.3) * 0.1;
	};
	return self;
});
var Monster = Container.expand(function () {
	var self = Container.call(this);
	var monsterGraphics = self.attachAsset('bird', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	monsterGraphics.tint = 0x8B0000; // Dark red color for monster
	monsterGraphics.scaleX = -2.0; // Negative scale to flip horizontally (face left), bigger than eagle
	monsterGraphics.scaleY = 2.0;
	self.speed = 5;
	self.health = 3; // Takes 3 bullets to kill
	self.maxHealth = 3;
	self.update = function () {
		self.x -= self.speed;
		// Track bird position and move towards it more aggressively
		if (bird && bird.health > 0) {
			var dx = bird.x - self.x;
			var dy = bird.y - self.y;
			var distance = Math.sqrt(dx * dx + dy * dy);
			if (distance > 0) {
				// Move towards bird faster than eagles
				var moveSpeed = 3;
				self.x += dx / distance * moveSpeed;
				self.y += dy / distance * moveSpeed;
			}
		}
		// Menacing animation with health-based tint
		var healthRatio = self.health / self.maxHealth;
		monsterGraphics.tint = healthRatio > 0.66 ? 0x8B0000 : healthRatio > 0.33 ? 0xFF4500 : 0xFF0000;
		monsterGraphics.rotation = Math.sin(LK.ticks * 0.4) * 0.2;
	};
	self.takeDamage = function () {
		self.health--;
		tween(self, {
			scaleX: -2.2,
			scaleY: 2.2
		}, {
			duration: 100,
			onFinish: function onFinish() {
				tween(self, {
					scaleX: -2.0,
					scaleY: 2.0
				}, {
					duration: 100
				});
			}
		});
		return self.health <= 0;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x87CEEB // Sky blue color
});

/**** 
* Game Code
****/ 
var bird = new Bird();
bird.x = 400;
bird.y = 2732 / 2;
game.addChild(bird);
var columns = [];
var coins = [];
var diamonds = [];
var eagles = [];
var monsters = [];
var bullets = [];
var columnSpawnTimer = 0;
var columnSpawnInterval = 90; // 1.5 seconds at 60fps
var eagleSpawnTimer = 0;
var eagleSpawnInterval = 180; // 3 seconds at 60fps
var monsterSpawnTimer = 0;
var monsterSpawnInterval = 300; // 5 seconds at 60fps
var gameSpeed = 4;
// UI Elements
var scoreTxt = new Text2('Score: 0', {
	size: 80,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0, 0);
scoreTxt.x = 120;
scoreTxt.y = 50;
LK.gui.topLeft.addChild(scoreTxt);
var healthBarBg = LK.getAsset('column', {
	width: 400,
	height: 30,
	anchorX: 1,
	anchorY: 0
});
healthBarBg.tint = 0x333333;
healthBarBg.x = -20;
healthBarBg.y = 50;
LK.gui.topRight.addChild(healthBarBg);
var healthBarFill = LK.getAsset('column', {
	width: 400,
	height: 30,
	anchorX: 0,
	anchorY: 0
});
healthBarFill.tint = 0x00FF00;
healthBarFill.x = -420;
healthBarFill.y = 50;
LK.gui.topRight.addChild(healthBarFill);
// Touch controls
game.down = function (x, y, obj) {
	if (obj.event && obj.event.button === 2) {
		// Right click - shoot
		bird.shoot();
	} else {
		// Left click or touch - flap
		bird.flap();
	}
};
game.update = function () {
	// Cloudless sky - no particles needed
	if (bird.health <= 0) {
		LK.showGameOver();
		return;
	}
	// Spawn columns
	columnSpawnTimer++;
	if (columnSpawnTimer >= columnSpawnInterval) {
		columnSpawnTimer = 0;
		var gapY = 400 + Math.random() * (2732 - 800); // Random gap position
		var hasCollectible = false;
		// Check if we should spawn a coin (always spawn)
		var newCoin = new Coin();
		newCoin.x = 2048 + 60;
		newCoin.y = gapY;
		newCoin.speed = gameSpeed;
		coins.push(newCoin);
		game.addChild(newCoin);
		hasCollectible = true;
		// Check if we should spawn a diamond (20% chance)
		if (Math.random() < 0.2) {
			var newDiamond = new Diamond();
			newDiamond.x = 2048 + 60;
			newDiamond.y = gapY + (Math.random() - 0.5) * 100; // Slight vertical offset
			newDiamond.speed = gameSpeed;
			diamonds.push(newDiamond);
			game.addChild(newDiamond);
			hasCollectible = true;
		}
		// Only create gap in column if there are collectibles
		var newColumn = new Column();
		newColumn.x = 2048 + 60;
		if (hasCollectible) {
			newColumn.init(gapY); // Create column with gap
		} else {
			newColumn.initSolid(); // Create solid column without gap
		}
		newColumn.speed = gameSpeed;
		columns.push(newColumn);
		game.addChild(newColumn);
	}
	// Spawn eagles
	eagleSpawnTimer++;
	if (eagleSpawnTimer >= eagleSpawnInterval) {
		eagleSpawnTimer = 0;
		var newEagle = new Eagle();
		newEagle.x = 2048 + 100;
		newEagle.y = 300 + Math.random() * (2732 - 600); // Random height position
		newEagle.speed = gameSpeed + 2; // Eagles fly faster than columns
		eagles.push(newEagle);
		game.addChild(newEagle);
	}
	// Spawn monsters after score 150
	if (LK.getScore() >= 150) {
		monsterSpawnTimer++;
		if (monsterSpawnTimer >= monsterSpawnInterval) {
			monsterSpawnTimer = 0;
			var newMonster = new Monster();
			newMonster.x = 2048 + 150;
			newMonster.y = 400 + Math.random() * (2732 - 800); // Random height position
			newMonster.speed = gameSpeed + 1; // Monsters fly slightly faster than columns
			monsters.push(newMonster);
			game.addChild(newMonster);
		}
	}
	// Update and check columns
	for (var i = columns.length - 1; i >= 0; i--) {
		var column = columns[i];
		// Remove off-screen columns
		if (column.x < -100) {
			column.destroy();
			columns.splice(i, 1);
			continue;
		}
		// Check for scoring
		if (!column.scored && column.x < bird.x) {
			column.scored = true;
			LK.setScore(LK.getScore() + 1);
			scoreTxt.setText('Score: ' + LK.getScore());
			LK.getSound('score').play();
		}
		// Collision detection with bird - only when hitting solid column parts
		if (!bird.invulnerable && bird.health > 0) {
			var birdBounds = {
				left: bird.x - 30,
				right: bird.x + 30,
				top: bird.y - 30,
				bottom: bird.y + 30
			};
			// Check if bird is horizontally overlapping with column
			var columnBounds = {
				left: column.x - 60,
				right: column.x + 60
			};
			if (birdBounds.right > columnBounds.left && birdBounds.left < columnBounds.right) {
				var hittingColumn = false;
				// Check for solid column (no gap)
				if (!column.bottomColumn) {
					// This is a solid column, bird hits it anywhere
					hittingColumn = true;
				} else {
					// This is a gapped column, check top and bottom parts
					var columnGapBounds = {
						topBottom: column.topColumn.y,
						bottomTop: column.bottomColumn.y
					};
					// Check if bird is hitting the solid top column (above the gap)
					var hittingTopColumn = birdBounds.top <= columnGapBounds.topBottom;
					// Check if bird is hitting the solid bottom column (below the gap)
					var hittingBottomColumn = birdBounds.bottom >= columnGapBounds.bottomTop;
					hittingColumn = hittingTopColumn || hittingBottomColumn;
				}
				if (hittingColumn) {
					if (bird.takeDamage()) {
						var healthPercent = Math.max(0, bird.health / bird.maxHealth);
						healthBarFill.width = 400 * healthPercent;
						if (healthPercent > 0.6) {
							healthBarFill.tint = 0x00FF00; // Green
						} else if (healthPercent > 0.3) {
							healthBarFill.tint = 0xFFFF00; // Yellow  
						} else {
							healthBarFill.tint = 0xFF0000; // Red
						}
					}
				}
			}
		}
	}
	// Update and check coins
	for (var k = coins.length - 1; k >= 0; k--) {
		var coin = coins[k];
		// Remove off-screen coins
		if (coin.x < -100) {
			coin.destroy();
			coins.splice(k, 1);
			continue;
		}
		// Check coin collection
		if (!coin.collected && bird.intersects(coin)) {
			coin.collected = true;
			LK.setScore(LK.getScore() + 2); // Coins give 2 points
			scoreTxt.setText('Score: ' + LK.getScore());
			LK.getSound('coin').play();
			coin.destroy();
			coins.splice(k, 1);
		}
	}
	// Update and check diamonds
	for (var d = diamonds.length - 1; d >= 0; d--) {
		var diamond = diamonds[d];
		// Remove off-screen diamonds
		if (diamond.x < -100) {
			diamond.destroy();
			diamonds.splice(d, 1);
			continue;
		}
		// Check diamond collection
		if (!diamond.collected && bird.intersects(diamond)) {
			diamond.collected = true;
			LK.setScore(LK.getScore() + 10); // Diamonds give 10 points
			scoreTxt.setText('Score: ' + LK.getScore());
			LK.getSound('coin').play(); // Use coin sound for now
			diamond.destroy();
			diamonds.splice(d, 1);
		}
	}
	// Update and check eagles
	for (var m = eagles.length - 1; m >= 0; m--) {
		var eagle = eagles[m];
		// Remove off-screen eagles
		if (eagle.x < -150) {
			eagle.destroy();
			eagles.splice(m, 1);
			continue;
		}
		// Check eagle collision with bird
		if (!bird.invulnerable && bird.health > 0 && bird.intersects(eagle)) {
			if (bird.takeDamage()) {
				var healthPercent = Math.max(0, bird.health / bird.maxHealth);
				healthBarFill.width = 400 * healthPercent;
				if (healthPercent > 0.6) {
					healthBarFill.tint = 0x00FF00; // Green
				} else if (healthPercent > 0.3) {
					healthBarFill.tint = 0xFFFF00; // Yellow
				} else {
					healthBarFill.tint = 0xFF0000; // Red
				}
			}
		}
	}
	// Update and check monsters
	for (var mo = monsters.length - 1; mo >= 0; mo--) {
		var monster = monsters[mo];
		// Remove off-screen monsters
		if (monster.x < -200) {
			monster.destroy();
			monsters.splice(mo, 1);
			continue;
		}
		// Check monster collision with bird
		if (!bird.invulnerable && bird.health > 0 && bird.intersects(monster)) {
			if (bird.takeDamage()) {
				var healthPercent = Math.max(0, bird.health / bird.maxHealth);
				healthBarFill.width = 400 * healthPercent;
				if (healthPercent > 0.6) {
					healthBarFill.tint = 0x00FF00; // Green
				} else if (healthPercent > 0.3) {
					healthBarFill.tint = 0xFFFF00; // Yellow
				} else {
					healthBarFill.tint = 0xFF0000; // Red
				}
			}
		}
	}
	// Update and check bullets
	for (var b = bullets.length - 1; b >= 0; b--) {
		var bullet = bullets[b];
		// Remove off-screen bullets
		if (bullet.x > 2200) {
			bullet.destroy();
			bullets.splice(b, 1);
			continue;
		}
		// Check bullet collision with eagles
		for (var e = eagles.length - 1; e >= 0; e--) {
			var eagle = eagles[e];
			if (bullet.intersects(eagle)) {
				// Eagle hit by bullet
				tween(eagle, {
					alpha: 0,
					scaleX: 0,
					scaleY: 0
				}, {
					duration: 300,
					onFinish: function onFinish() {
						eagle.destroy();
					}
				});
				eagles.splice(e, 1);
				bullet.destroy();
				bullets.splice(b, 1);
				LK.setScore(LK.getScore() + 5); // 5 points for killing eagle
				scoreTxt.setText('Score: ' + LK.getScore());
				break;
			}
		}
		// Check bullet collision with monsters
		for (var mo = monsters.length - 1; mo >= 0; mo--) {
			var monster = monsters[mo];
			if (bullet.intersects(monster)) {
				// Monster hit by bullet
				bullet.destroy();
				bullets.splice(b, 1);
				if (monster.takeDamage()) {
					// Monster destroyed after taking enough damage
					tween(monster, {
						alpha: 0,
						scaleX: 0,
						scaleY: 0
					}, {
						duration: 500,
						onFinish: function onFinish() {
							monster.destroy();
						}
					});
					monsters.splice(mo, 1);
					LK.setScore(LK.getScore() + 15); // 15 points for killing monster
					scoreTxt.setText('Score: ' + LK.getScore());
				}
				break;
			}
		}
	}
	// Increase difficulty over time
	if (LK.getScore() > 0 && LK.getScore() % 10 == 0) {
		if (gameSpeed < 8) {
			gameSpeed = 4 + LK.getScore() / 10 * 0.5;
			for (var j = 0; j < columns.length; j++) {
				columns[j].speed = gameSpeed;
			}
			for (var l = 0; l < coins.length; l++) {
				coins[l].speed = gameSpeed;
			}
			for (var p = 0; p < diamonds.length; p++) {
				diamonds[p].speed = gameSpeed;
			}
			for (var n = 0; n < eagles.length; n++) {
				eagles[n].speed = gameSpeed + 2;
			}
			for (var mo = 0; mo < monsters.length; mo++) {
				monsters[mo].speed = gameSpeed + 1;
			}
		}
	}
};

===================================================================
--- original.js
+++ change.js
@@ -215,8 +215,59 @@
 		eagleGraphics.rotation = Math.sin(LK.ticks * 0.3) * 0.1;
 	};
 	return self;
 });
+var Monster = Container.expand(function () {
+	var self = Container.call(this);
+	var monsterGraphics = self.attachAsset('bird', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	monsterGraphics.tint = 0x8B0000; // Dark red color for monster
+	monsterGraphics.scaleX = -2.0; // Negative scale to flip horizontally (face left), bigger than eagle
+	monsterGraphics.scaleY = 2.0;
+	self.speed = 5;
+	self.health = 3; // Takes 3 bullets to kill
+	self.maxHealth = 3;
+	self.update = function () {
+		self.x -= self.speed;
+		// Track bird position and move towards it more aggressively
+		if (bird && bird.health > 0) {
+			var dx = bird.x - self.x;
+			var dy = bird.y - self.y;
+			var distance = Math.sqrt(dx * dx + dy * dy);
+			if (distance > 0) {
+				// Move towards bird faster than eagles
+				var moveSpeed = 3;
+				self.x += dx / distance * moveSpeed;
+				self.y += dy / distance * moveSpeed;
+			}
+		}
+		// Menacing animation with health-based tint
+		var healthRatio = self.health / self.maxHealth;
+		monsterGraphics.tint = healthRatio > 0.66 ? 0x8B0000 : healthRatio > 0.33 ? 0xFF4500 : 0xFF0000;
+		monsterGraphics.rotation = Math.sin(LK.ticks * 0.4) * 0.2;
+	};
+	self.takeDamage = function () {
+		self.health--;
+		tween(self, {
+			scaleX: -2.2,
+			scaleY: 2.2
+		}, {
+			duration: 100,
+			onFinish: function onFinish() {
+				tween(self, {
+					scaleX: -2.0,
+					scaleY: 2.0
+				}, {
+					duration: 100
+				});
+			}
+		});
+		return self.health <= 0;
+	};
+	return self;
+});
 
 /**** 
 * Initialize Game
 ****/ 
@@ -234,13 +285,16 @@
 var columns = [];
 var coins = [];
 var diamonds = [];
 var eagles = [];
+var monsters = [];
 var bullets = [];
 var columnSpawnTimer = 0;
 var columnSpawnInterval = 90; // 1.5 seconds at 60fps
 var eagleSpawnTimer = 0;
 var eagleSpawnInterval = 180; // 3 seconds at 60fps
+var monsterSpawnTimer = 0;
+var monsterSpawnInterval = 300; // 5 seconds at 60fps
 var gameSpeed = 4;
 // UI Elements
 var scoreTxt = new Text2('Score: 0', {
 	size: 80,
@@ -332,8 +386,21 @@
 		newEagle.speed = gameSpeed + 2; // Eagles fly faster than columns
 		eagles.push(newEagle);
 		game.addChild(newEagle);
 	}
+	// Spawn monsters after score 150
+	if (LK.getScore() >= 150) {
+		monsterSpawnTimer++;
+		if (monsterSpawnTimer >= monsterSpawnInterval) {
+			monsterSpawnTimer = 0;
+			var newMonster = new Monster();
+			newMonster.x = 2048 + 150;
+			newMonster.y = 400 + Math.random() * (2732 - 800); // Random height position
+			newMonster.speed = gameSpeed + 1; // Monsters fly slightly faster than columns
+			monsters.push(newMonster);
+			game.addChild(newMonster);
+		}
+	}
 	// Update and check columns
 	for (var i = columns.length - 1; i >= 0; i--) {
 		var column = columns[i];
 		// Remove off-screen columns
@@ -457,8 +524,32 @@
 				}
 			}
 		}
 	}
+	// Update and check monsters
+	for (var mo = monsters.length - 1; mo >= 0; mo--) {
+		var monster = monsters[mo];
+		// Remove off-screen monsters
+		if (monster.x < -200) {
+			monster.destroy();
+			monsters.splice(mo, 1);
+			continue;
+		}
+		// Check monster collision with bird
+		if (!bird.invulnerable && bird.health > 0 && bird.intersects(monster)) {
+			if (bird.takeDamage()) {
+				var healthPercent = Math.max(0, bird.health / bird.maxHealth);
+				healthBarFill.width = 400 * healthPercent;
+				if (healthPercent > 0.6) {
+					healthBarFill.tint = 0x00FF00; // Green
+				} else if (healthPercent > 0.3) {
+					healthBarFill.tint = 0xFFFF00; // Yellow
+				} else {
+					healthBarFill.tint = 0xFF0000; // Red
+				}
+			}
+		}
+	}
 	// Update and check bullets
 	for (var b = bullets.length - 1; b >= 0; b--) {
 		var bullet = bullets[b];
 		// Remove off-screen bullets
@@ -489,8 +580,34 @@
 				scoreTxt.setText('Score: ' + LK.getScore());
 				break;
 			}
 		}
+		// Check bullet collision with monsters
+		for (var mo = monsters.length - 1; mo >= 0; mo--) {
+			var monster = monsters[mo];
+			if (bullet.intersects(monster)) {
+				// Monster hit by bullet
+				bullet.destroy();
+				bullets.splice(b, 1);
+				if (monster.takeDamage()) {
+					// Monster destroyed after taking enough damage
+					tween(monster, {
+						alpha: 0,
+						scaleX: 0,
+						scaleY: 0
+					}, {
+						duration: 500,
+						onFinish: function onFinish() {
+							monster.destroy();
+						}
+					});
+					monsters.splice(mo, 1);
+					LK.setScore(LK.getScore() + 15); // 15 points for killing monster
+					scoreTxt.setText('Score: ' + LK.getScore());
+				}
+				break;
+			}
+		}
 	}
 	// Increase difficulty over time
 	if (LK.getScore() > 0 && LK.getScore() % 10 == 0) {
 		if (gameSpeed < 8) {
@@ -506,7 +623,10 @@
 			}
 			for (var n = 0; n < eagles.length; n++) {
 				eagles[n].speed = gameSpeed + 2;
 			}
+			for (var mo = 0; mo < monsters.length; mo++) {
+				monsters[mo].speed = gameSpeed + 1;
+			}
 		}
 	}
 };
\ No newline at end of file