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

/**** 
* Classes
****/ 
// Enemy class
var Enemy = Container.expand(function () {
	var self = Container.call(this);
	var enemyGfx = self.attachAsset('enemy', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.hp = 1;
	self.x = 600;
	self.y = 2732 / 2;
	self.isAlive = true;
	// Animate enemy in
	self.spawnAnim = function () {
		self.scaleX = 0.5;
		self.scaleY = 0.5;
		tween(self, {
			scaleX: 1,
			scaleY: 1
		}, {
			duration: 180,
			easing: tween.bounceOut
		});
	};
	// Animate enemy defeat
	self.defeatAnim = function (onFinish) {
		tween(self, {
			alpha: 0,
			scaleX: 1.3,
			scaleY: 1.3
		}, {
			duration: 180,
			easing: tween.easeIn,
			onFinish: onFinish
		});
	};
	return self;
});
// Gold class
var Gold = Container.expand(function () {
	var self = Container.call(this);
	var goldGfx = self.attachAsset('gold', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.x = 600;
	self.y = 2732 / 2;
	// Animate gold drop
	self.dropAnim = function (targetX, targetY, onFinish) {
		tween(self, {
			y: targetY
		}, {
			duration: 350,
			easing: tween.bounceOut,
			onFinish: onFinish
		});
	};
	// Animate gold collect
	self.collectAnim = function (targetX, targetY, onFinish) {
		tween(self, {
			x: targetX,
			y: targetY,
			scaleX: 0.3,
			scaleY: 0.3,
			alpha: 0
		}, {
			duration: 320,
			easing: tween.cubicIn,
			onFinish: onFinish
		});
	};
	return self;
});
// Hero class
var Hero = Container.expand(function () {
	var self = Container.call(this);
	var heroGfx = self.attachAsset('hero', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.level = 1;
	self.x = 200;
	self.y = 2732 / 2;
	// For upgrade animation
	self.flashUpgrade = function () {
		tween(self, {
			scaleX: 1.2,
			scaleY: 1.2
		}, {
			duration: 120,
			easing: tween.easeOut,
			onFinish: function onFinish() {
				tween(self, {
					scaleX: 1,
					scaleY: 1
				}, {
					duration: 120,
					easing: tween.easeIn
				});
			}
		});
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x222a36
});

/**** 
* Game Code
****/ 
// --- Background Image ---
// Hero: red box, left side
// Enemy: blue ellipse
// Gold: yellow ellipse
// Spawn Enemy Button: green box
// Upgrade Button: orange box
var backgroundImg = LK.getAsset('backgraund', {
	anchorX: 0,
	anchorY: 0,
	x: 0,
	y: 0,
	width: 2048,
	height: 2732
});
game.addChild(backgroundImg);
// --- Global State ---
var hero = new Hero();
game.addChild(hero);
var currentEnemy = null;
var golds = [];
var goldAmount = 0;
var heroLevel = 1;
// Auto-fight timer handles
var heroAutoAttackTimer = null;
var enemyAutoAttackTimer = null;
// --- GUI Elements ---
// Gold display (top right)
var goldTxt = new Text2('0', {
	size: 70,
	fill: 0xFFE066,
	glow: {
		color: 0xffffff,
		distance: 10,
		strength: 2
	}
});
goldTxt.anchor.set(1, 0); // right, top
LK.gui.topRight.addChild(goldTxt);
// --- Hero and Enemy Stats Display ---
// Removed hero and enemy images from the bottom stats area
// Hero stats text (bottom left)
var heroStatsTxt = new Text2('', {
	size: 40,
	fill: "#000",
	glow: {
		color: 0xffffff,
		distance: 8,
		strength: 2
	}
});
heroStatsTxt.anchor.set(0, 1);
heroStatsTxt.x = 30;
heroStatsTxt.y = LK.gui.bottom.height - 30;
LK.gui.bottomLeft.addChild(heroStatsTxt);
// Enemy stats text (bottom right, moved slightly to the right)
var enemyStatsTxt = new Text2('', {
	size: 40,
	fill: "#000",
	glow: {
		color: 0xffffff,
		distance: 8,
		strength: 2
	}
});
enemyStatsTxt.anchor.set(1, 1);
// Move enemy stats slightly to the right (less offset from right edge)
enemyStatsTxt.x = LK.gui.bottomRight.width - 130;
enemyStatsTxt.y = LK.gui.bottom.height - 30;
LK.gui.bottomRight.addChild(enemyStatsTxt);
// Upgrade button (top center)
var upgradeBtn = LK.getAsset('upgradeBtn', {
	anchorX: 0.5,
	anchorY: 0.5
});
// Place upgradeBtn at top center, but not in the top left 100x100 area
// Use LK.gui.top (centered horizontally, below top edge)
upgradeBtn.x = LK.gui.top.width / 2;
upgradeBtn.y = 100 + upgradeBtn.height / 2;
// Add gold required text under the upgrade button
var upgradeCostTxt = new Text2("", {
	size: 40,
	fill: 0x222A36,
	glow: {
		color: 0xffffff,
		distance: 8,
		strength: 2
	}
});
upgradeCostTxt.anchor.set(0.5, 0);
upgradeCostTxt.x = upgradeBtn.x;
upgradeCostTxt.y = upgradeBtn.y + upgradeBtn.height / 2 + 10;
LK.gui.top.addChild(upgradeCostTxt);
LK.gui.top.addChild(upgradeBtn);
// Spawn enemy button (bottom center)
var spawnBtn = LK.getAsset('spawnBtn', {
	anchorX: 0.5,
	anchorY: 0.5
});
// Place spawnBtn at bottom center, above the very bottom edge
spawnBtn.x = LK.gui.bottom.width / 2;
spawnBtn.y = LK.gui.bottom.height - 100 - spawnBtn.height / 2;
// Add "find enemy!" text above the spawn button
var findEnemyTxt = new Text2("find enemy!", {
	size: 45,
	fill: 0x222A36,
	glow: {
		color: 0xffffff,
		distance: 8,
		strength: 2
	}
});
findEnemyTxt.anchor.set(0.5, 1);
findEnemyTxt.x = spawnBtn.x;
findEnemyTxt.y = spawnBtn.y - spawnBtn.height / 2 - 20;
LK.gui.bottom.addChild(findEnemyTxt);
LK.gui.bottom.addChild(spawnBtn);
// --- Helper Functions ---
function updateGoldDisplay() {
	goldTxt.setText(goldAmount);
}
function updateUpgradeDisplay() {
	// Show gold required to upgrade under the upgrade button
	if (typeof upgradeCostTxt !== "undefined") {
		var nextUpgradeCost = heroLevel * 5;
		upgradeCostTxt.setText("Gold required: " + nextUpgradeCost);
	}
}
// Update hero stats display
function updateHeroStatsDisplay() {
	var stats = getStatsForLevel(heroLevel, "hero");
	var hpDisplay = typeof hero.currentHp === "number" ? Math.max(0, Math.round(hero.currentHp)) + " / " + stats.hp : stats.hp;
	heroStatsTxt.setText("Hero\n" + "Level: " + heroLevel + "\n" + "Health: " + hpDisplay + "\n" + "Attack: " + stats.atk + "\n" + "Atk Spd: " + stats.atkSpd);
}
// Update enemy stats display
function updateEnemyStatsDisplay() {
	if (currentEnemy && currentEnemy.isAlive) {
		var enemyLevel = currentEnemy.level || heroLevel;
		var stats = getStatsForLevel(enemyLevel, "enemy");
		var hpDisplay = typeof currentEnemy.hp === "number" ? Math.max(0, Math.round(currentEnemy.hp)) + " / " + stats.hp : stats.hp;
		enemyStatsTxt.setText("Enemy\n" + "Level: " + enemyLevel + "\n" + "Health: " + hpDisplay + "\n" + "Attack: " + currentEnemy.attack + "\n" + "Atk Spd: " + currentEnemy.attackSpeed);
	} else {
		enemyStatsTxt.setText("Enemy\n-");
	}
}
// --- Game Logic ---
// Spawn enemy logic
// Enemy stat table for levels 1-10 (fixed stats)
var enemyStatsByLevel = [
// Level 1
{
	hp: 60,
	atk: 10,
	atkSpd: 2
},
// Level 2
{
	hp: 95,
	atk: 14,
	atkSpd: 3
},
// Level 3
{
	hp: 130,
	atk: 18,
	atkSpd: 4
},
// Level 4
{
	hp: 170,
	atk: 23,
	atkSpd: 4
},
// Level 5
{
	hp: 215,
	atk: 27,
	atkSpd: 5
},
// Level 6
{
	hp: 265,
	atk: 32,
	atkSpd: 6
},
// Level 7
{
	hp: 320,
	atk: 38,
	atkSpd: 6
},
// Level 8
{
	hp: 380,
	atk: 45,
	atkSpd: 7
},
// Level 9
{
	hp: 445,
	atk: 53,
	atkSpd: 8
},
// Level 10
{
	hp: 515,
	atk: 62,
	atkSpd: 9
}];
// --- Stat scaling logic for hero and enemy after level 10 ---
// Store hero stat growth per level (compounded) and enemy stat growth per level (linear from level 10 base)
var heroStatGrowth = {
	hp: [enemyStatsByLevel[9].hp],
	atk: [enemyStatsByLevel[9].atk],
	atkSpd: [enemyStatsByLevel[9].atkSpd]
};
var enemyStatGrowth = {
	hp: [enemyStatsByLevel[9].hp],
	atk: [enemyStatsByLevel[9].atk],
	atkSpd: [enemyStatsByLevel[9].atkSpd]
};
// Store enemy stat percent increases per level (for linear scaling)
var enemyStatPercents = {
	hp: [],
	atk: [],
	atkSpd: []
};
// Store hero stat percent increases per level (for compounded scaling)
var heroStatPercents = {
	hp: [],
	atk: [],
	atkSpd: []
};
// Helper to get random percent between 5% and 20%
function randomPercent() {
	return 0.05 + Math.random() * 0.15;
}
// Precompute stat growth up to a reasonable max level (e.g. 100)
function ensureStatGrowthUpTo(level) {
	var maxComputed = heroStatGrowth.hp.length + 9; // since index 0 is level 10
	for (var lvl = maxComputed + 1; lvl <= level; lvl++) {
		// HERO: compounded
		var prevHeroHp = heroStatGrowth.hp[heroStatGrowth.hp.length - 1];
		var prevHeroAtk = heroStatGrowth.atk[heroStatGrowth.atk.length - 1];
		var prevHeroAtkSpd = heroStatGrowth.atkSpd[heroStatGrowth.atkSpd.length - 1];
		var heroHpPct = randomPercent();
		var heroAtkPct = randomPercent();
		// After level 15, hero attack speed no longer increases
		var heroAtkSpdPct = lvl > 15 ? 0 : randomPercent();
		heroStatPercents.hp.push(heroHpPct);
		heroStatPercents.atk.push(heroAtkPct);
		heroStatPercents.atkSpd.push(heroAtkSpdPct);
		heroStatGrowth.hp.push(Math.round(prevHeroHp * (1 + heroHpPct)));
		heroStatGrowth.atk.push(Math.round(prevHeroAtk * (1 + heroAtkPct)));
		heroStatGrowth.atkSpd.push(Math.round(prevHeroAtkSpd * (1 + heroAtkSpdPct)));
		// ENEMY: linear from level 10 base
		var baseHp = enemyStatsByLevel[9].hp;
		var baseAtk = enemyStatsByLevel[9].atk;
		var baseAtkSpd = enemyStatsByLevel[9].atkSpd;
		var enemyHpPct = randomPercent();
		var enemyAtkPct = randomPercent();
		// After level 15, enemy attack speed no longer increases
		var enemyAtkSpdPct = lvl > 15 ? 0 : randomPercent();
		enemyStatPercents.hp.push(enemyHpPct);
		enemyStatPercents.atk.push(enemyAtkPct);
		enemyStatPercents.atkSpd.push(enemyAtkSpdPct);
		// For linear, sum all previous percent increases
		var totalHpPct = 0;
		var totalAtkPct = 0;
		var totalAtkSpdPct = 0;
		for (var i = 0; i < enemyStatPercents.hp.length; i++) totalHpPct += enemyStatPercents.hp[i];
		for (var i = 0; i < enemyStatPercents.atk.length; i++) totalAtkPct += enemyStatPercents.atk[i];
		for (var i = 0; i < enemyStatPercents.atkSpd.length; i++) totalAtkSpdPct += enemyStatPercents.atkSpd[i];
		// After level 20, enemy health increases by an additional 50% per level
		var extraHpMultiplier = 1;
		if (lvl > 20) {
			// For each level above 20, multiply by 1.5 for each extra level
			extraHpMultiplier = Math.pow(1.5, lvl - 20);
		}
		enemyStatGrowth.hp.push(Math.round(baseHp * (1 + totalHpPct) * extraHpMultiplier));
		enemyStatGrowth.atk.push(Math.round(baseAtk * (1 + totalAtkPct)));
		enemyStatGrowth.atkSpd.push(Math.round(baseAtkSpd * (1 + totalAtkSpdPct)));
	}
}
// Returns stats for a given level and type ('hero' or 'enemy')
function getStatsForLevel(level, type) {
	if (level <= 10) {
		var idx = Math.max(0, Math.min(enemyStatsByLevel.length - 1, level - 1));
		var stats = enemyStatsByLevel[idx];
		return {
			hp: stats.hp,
			atk: stats.atk,
			atkSpd: stats.atkSpd
		};
	}
	ensureStatGrowthUpTo(level);
	var idx = level - 10;
	if (type === "hero") {
		return {
			hp: heroStatGrowth.hp[idx],
			atk: heroStatGrowth.atk[idx],
			atkSpd: heroStatGrowth.atkSpd[idx]
		};
	} else {
		return {
			hp: enemyStatGrowth.hp[idx],
			atk: enemyStatGrowth.atk[idx],
			atkSpd: enemyStatGrowth.atkSpd[idx]
		};
	}
}
// For backward compatibility, keep getEnemyStatsForLevel for hero stats (used in refill, etc)
function getEnemyStatsForLevel(level) {
	return getStatsForLevel(level, "hero");
}
function spawnEnemy() {
	if (currentEnemy && currentEnemy.isAlive) return; // Only one at a time
	if (hero.healthRefilling) return; // Don't allow spawn while refilling
	var enemy = new Enemy();
	// Place enemy on the far right, vertically aligned with hero
	enemy.x = 2048 - 200; // 200px from the right edge, matching hero's 200px from left
	enemy.y = hero.y;
	// Determine enemy level: always one of heroLevel-1, heroLevel, heroLevel+1, or heroLevel+2
	var possibleLevels = [Math.max(1, heroLevel - 1), heroLevel, heroLevel + 1, heroLevel + 2];
	// Remove duplicates and clamp to at least 1
	var uniqueLevels = [];
	for (var i = 0; i < possibleLevels.length; i++) {
		var lvl = Math.max(1, possibleLevels[i]);
		if (uniqueLevels.indexOf(lvl) === -1) uniqueLevels.push(lvl);
	}
	// Randomly pick one
	var enemyLevel = uniqueLevels[Math.floor(Math.random() * uniqueLevels.length)];
	// Clamp enemyLevel to valid range for stats table
	enemyLevel = Math.max(1, Math.min(enemyStatsByLevel.length + heroStatGrowth.hp.length, enemyLevel));
	// Get stats for this level (enemy uses linear scaling after level 10)
	var stats = getStatsForLevel(enemyLevel, "enemy");
	enemy.hp = stats.hp;
	enemy.attack = stats.atk;
	enemy.attackSpeed = stats.atkSpd;
	enemy.isAlive = true;
	enemy.spawnAnim();
	game.addChild(enemy);
	currentEnemy = enemy;
	// Store the enemy's level for display
	currentEnemy.level = enemyLevel;
	updateEnemyStatsDisplay();
	// --- Start auto-fight timers ---
	if (typeof heroAutoAttackTimer !== "undefined" && heroAutoAttackTimer) {
		LK.clearInterval(heroAutoAttackTimer);
		heroAutoAttackTimer = null;
	}
	if (typeof enemyAutoAttackTimer !== "undefined" && enemyAutoAttackTimer) {
		LK.clearInterval(enemyAutoAttackTimer);
		enemyAutoAttackTimer = null;
	}
	// Get hero stats for this level (hero uses compounded scaling after level 10)
	var heroStats = getStatsForLevel(heroLevel, "hero");
	hero.currentHp = heroStats.hp;
	hero.attack = heroStats.atk;
	hero.attackSpeed = heroStats.atkSpd;
	// Hero attacks enemy
	heroAutoAttackTimer = LK.setInterval(function () {
		if (!currentEnemy || !currentEnemy.isAlive) {
			LK.clearInterval(heroAutoAttackTimer);
			heroAutoAttackTimer = null;
			return;
		}
		currentEnemy.hp -= hero.attack;
		// Flash enemy
		if (currentEnemy) {
			tween(currentEnemy, {
				tint: 0xffffff
			}, {
				duration: 60,
				onFinish: function onFinish() {
					if (currentEnemy) {
						tween(currentEnemy, {
							tint: 0x2a6bde
						}, {
							duration: 60
						});
					}
				}
			});
		}
		updateEnemyStatsDisplay();
		if (currentEnemy.hp <= 0) {
			defeatEnemy();
			LK.clearInterval(heroAutoAttackTimer);
			heroAutoAttackTimer = null;
			LK.clearInterval(enemyAutoAttackTimer);
			enemyAutoAttackTimer = null;
		}
	}, 1000 / hero.attackSpeed);
	// Enemy attacks hero
	enemyAutoAttackTimer = LK.setInterval(function () {
		if (!currentEnemy || !currentEnemy.isAlive) {
			LK.clearInterval(enemyAutoAttackTimer);
			enemyAutoAttackTimer = null;
			return;
		}
		if (typeof hero.currentHp !== "number") {
			// Defensive: ensure hero.currentHp is set
			var hStats = getEnemyStatsForLevel(heroLevel);
			hero.currentHp = hStats.hp;
		}
		hero.currentHp -= currentEnemy.attack;
		// Flash hero
		tween(hero, {
			tint: 0xffffff
		}, {
			duration: 60,
			onFinish: function onFinish() {
				tween(hero, {
					tint: 0xd83318
				}, {
					duration: 60
				});
			}
		});
		updateHeroStatsDisplay();
		if (hero.currentHp <= 0) {
			// Hero defeated, stop fighting
			hero.currentHp = 0;
			updateHeroStatsDisplay();
			// Optionally, you can add defeat logic here (e.g. show game over)
			LK.clearInterval(heroAutoAttackTimer);
			heroAutoAttackTimer = null;
			LK.clearInterval(enemyAutoAttackTimer);
			enemyAutoAttackTimer = null;
			// Start health refill (handled in update loop)
			hero.healthRefilling = false; // Will be set to true in update loop
		}
	}, 1000 / currentEnemy.attackSpeed);
}
// Defeat enemy logic
function defeatEnemy() {
	if (!currentEnemy || !currentEnemy.isAlive) return;
	currentEnemy.isAlive = false;
	// Stop auto-fight timers
	if (typeof heroAutoAttackTimer !== "undefined" && heroAutoAttackTimer) {
		LK.clearInterval(heroAutoAttackTimer);
		heroAutoAttackTimer = null;
	}
	if (typeof enemyAutoAttackTimer !== "undefined" && enemyAutoAttackTimer) {
		LK.clearInterval(enemyAutoAttackTimer);
		enemyAutoAttackTimer = null;
	}
	currentEnemy.defeatAnim(function () {
		if (currentEnemy) {
			currentEnemy.destroy();
			currentEnemy = null;
			updateEnemyStatsDisplay();
		}
	});
	// --- Gold drop amount table per level ---
	var goldDropByLevel = [{
		min: 1,
		max: 5
	},
	// Level 1
	{
		min: 3,
		max: 8
	},
	// Level 2
	{
		min: 5,
		max: 12
	},
	// Level 3
	{
		min: 8,
		max: 16
	},
	// Level 4
	{
		min: 12,
		max: 20
	},
	// Level 5
	{
		min: 15,
		max: 25
	},
	// Level 6
	{
		min: 20,
		max: 32
	},
	// Level 7
	{
		min: 25,
		max: 40
	},
	// Level 8
	{
		min: 30,
		max: 48
	},
	// Level 9
	{
		min: 35,
		max: 60
	} // Level 10
	];
	// Determine gold drop amount for this level
	var goldDropStats = goldDropByLevel[Math.max(0, Math.min(heroLevel - 1, goldDropByLevel.length - 1))];
	var goldDropAmount = Math.floor(Math.random() * (goldDropStats.max - goldDropStats.min + 1)) + goldDropStats.min;
	// Drop gold at the far right (where enemy was)
	// Animate and auto-collect gold after enemy defeat
	// Calculate the gold display position in game coordinates (top right, where goldTxt is)
	var goldDisplayGlobal = LK.gui.topRight.toGlobal({
		x: goldTxt.x,
		y: goldTxt.y
	});
	var goldDisplayGamePos = game.toLocal(goldDisplayGlobal);
	for (var i = 0; i < goldDropAmount; i++) {
		var gold = new Gold();
		gold.x = 2048 - 200;
		gold.y = hero.y;
		gold.scaleX = 1;
		gold.scaleY = 1;
		gold.alpha = 1;
		game.addChild(gold);
		golds.push(gold);
		// Drop to random y near enemy
		var dropY = gold.y + (Math.random() * 120 - 60);
		(function (goldObj, idx) {
			goldObj.dropAnim(goldObj.x, dropY, function () {
				// Stagger collection for nice effect
				LK.setTimeout(function () {
					// Animate to gold display and collect
					goldObj.collectAnim(goldDisplayGamePos.x, goldDisplayGamePos.y, function () {
						goldAmount += 1;
						updateGoldDisplay();
						goldObj.destroy();
					});
				}, 80 * idx);
			});
		})(gold, i);
	}
}
// Collect gold logic
function collectGold(gold) {
	// Animate to gold display
	var guiGoldPos = LK.gui.topRight.toLocal(gold.toGlobal({
		x: 0,
		y: 0
	}));
	goldAmount += 1;
	updateGoldDisplay();
	gold.collectAnim(guiGoldPos.x, guiGoldPos.y, function () {
		gold.destroy();
	});
}
// Upgrade logic
function upgradeHero() {
	var upgradeCost = heroLevel * 5;
	if (goldAmount < upgradeCost) {
		// Flash gold text red
		tween(goldTxt, {
			tint: 0xff4444
		}, {
			duration: 120,
			onFinish: function onFinish() {
				tween(goldTxt, {
					tint: 0xFFE066
				}, {
					duration: 120
				});
			}
		});
		return;
	}
	goldAmount -= upgradeCost;
	heroLevel += 1;
	hero.level = heroLevel;
	updateGoldDisplay();
	updateUpgradeDisplay();
	updateHeroStatsDisplay();
	updateEnemyStatsDisplay();
	hero.flashUpgrade();
}
// --- Event Handlers ---
// Spawn button tap
spawnBtn.down = function (x, y, obj) {
	spawnEnemy();
};
// Enemy tap (defeat)
function onEnemyDown(x, y, obj) {
	if (!currentEnemy || !currentEnemy.isAlive) return;
	currentEnemy.hp -= 1;
	// Flash enemy
	tween(currentEnemy, {
		tint: 0xffffff
	}, {
		duration: 60,
		onFinish: function onFinish() {
			tween(currentEnemy, {
				tint: 0x2a6bde
			}, {
				duration: 60
			});
		}
	});
	if (currentEnemy.hp <= 0) {
		defeatEnemy();
	}
}
// Gold tap (collect)
function onGoldDown(x, y, obj) {
	for (var i = golds.length - 1; i >= 0; i--) {
		var gold = golds[i];
		if (gold && gold.containsPoint && gold.containsPoint({
			x: x,
			y: y
		})) {
			collectGold(gold);
			golds.splice(i, 1);
			break;
		}
	}
}
// Upgrade button tap
upgradeBtn.down = function (x, y, obj) {
	upgradeHero();
};
// --- Attach event handlers to game ---
game.down = function (x, y, obj) {
	// Check if tap is on enemy
	if (currentEnemy && currentEnemy.isAlive && currentEnemy.containsPoint && currentEnemy.containsPoint({
		x: x,
		y: y
	})) {
		onEnemyDown(x, y, obj);
		return;
	}
	// Check if tap is on any gold
	for (var i = golds.length - 1; i >= 0; i--) {
		var gold = golds[i];
		if (gold && gold.containsPoint && gold.containsPoint({
			x: x,
			y: y
		})) {
			collectGold(gold);
			golds.splice(i, 1);
			return;
		}
	}
	// (Buttons handled by their own .down)
};
// --- Game update loop ---
game.update = function () {
	// Remove golds that are invisible
	for (var i = golds.length - 1; i >= 0; i--) {
		var gold = golds[i];
		if (gold.alpha <= 0.01) {
			gold.destroy();
			golds.splice(i, 1);
		}
	}
	// --- Hero health refill logic ---
	if (typeof hero.healthRefilling === "undefined") hero.healthRefilling = false;
	if (typeof hero.refillStartTime === "undefined") hero.refillStartTime = 0;
	if (typeof hero.refillDuration === "undefined") hero.refillDuration = 1000;
	if (typeof hero.refillFromHp === "undefined") hero.refillFromHp = 0;
	if (typeof hero.refillToHp === "undefined") hero.refillToHp = 0;
	if (typeof hero.currentHp === "number" && hero.currentHp <= 0 && !hero.healthRefilling) {
		// Start refill
		hero.healthRefilling = true;
		hero.refillStartTime = Date.now();
		var stats = getStatsForLevel(heroLevel, "hero");
		hero.refillFromHp = 0;
		hero.refillToHp = stats.hp;
		// Destroy enemy immediately (so a new one can only be summoned after refill)
		if (currentEnemy && currentEnemy.isAlive) {
			currentEnemy.isAlive = false;
			currentEnemy.defeatAnim(function () {
				if (currentEnemy) {
					currentEnemy.destroy();
					currentEnemy = null;
					updateEnemyStatsDisplay();
				}
			});
		}
	}
	if (hero.healthRefilling) {
		var now = Date.now();
		var elapsed = now - hero.refillStartTime;
		var t = Math.min(1, elapsed / hero.refillDuration);
		var stats = getStatsForLevel(heroLevel, "hero");
		hero.currentHp = Math.round(hero.refillFromHp + (hero.refillToHp - hero.refillFromHp) * t);
		if (t >= 1) {
			hero.currentHp = stats.hp;
			hero.healthRefilling = false;
		}
	}
	// Keep hero slightly lower than vertical center
	hero.y = 2732 / 2 + 200;
	// Keep enemy vertically centered and at far right if alive
	if (currentEnemy && currentEnemy.isAlive) {
		currentEnemy.x = 2048 - 200;
		currentEnemy.y = hero.y + 100; // Move enemy a little lower
	}
	updateHeroStatsDisplay();
	updateEnemyStatsDisplay();
};
// --- Initial UI state ---
updateGoldDisplay();
updateUpgradeDisplay();
updateHeroStatsDisplay();
updateEnemyStatsDisplay();

===================================================================
--- original.js
+++ change.js
@@ -365,9 +365,10 @@
 		var prevHeroAtk = heroStatGrowth.atk[heroStatGrowth.atk.length - 1];
 		var prevHeroAtkSpd = heroStatGrowth.atkSpd[heroStatGrowth.atkSpd.length - 1];
 		var heroHpPct = randomPercent();
 		var heroAtkPct = randomPercent();
-		var heroAtkSpdPct = randomPercent();
+		// After level 15, hero attack speed no longer increases
+		var heroAtkSpdPct = lvl > 15 ? 0 : randomPercent();
 		heroStatPercents.hp.push(heroHpPct);
 		heroStatPercents.atk.push(heroAtkPct);
 		heroStatPercents.atkSpd.push(heroAtkSpdPct);
 		heroStatGrowth.hp.push(Math.round(prevHeroHp * (1 + heroHpPct)));
@@ -378,9 +379,10 @@
 		var baseAtk = enemyStatsByLevel[9].atk;
 		var baseAtkSpd = enemyStatsByLevel[9].atkSpd;
 		var enemyHpPct = randomPercent();
 		var enemyAtkPct = randomPercent();
-		var enemyAtkSpdPct = randomPercent();
+		// After level 15, enemy attack speed no longer increases
+		var enemyAtkSpdPct = lvl > 15 ? 0 : randomPercent();
 		enemyStatPercents.hp.push(enemyHpPct);
 		enemyStatPercents.atk.push(enemyAtkPct);
 		enemyStatPercents.atkSpd.push(enemyAtkSpdPct);
 		// For linear, sum all previous percent increases
@@ -389,9 +391,15 @@
 		var totalAtkSpdPct = 0;
 		for (var i = 0; i < enemyStatPercents.hp.length; i++) totalHpPct += enemyStatPercents.hp[i];
 		for (var i = 0; i < enemyStatPercents.atk.length; i++) totalAtkPct += enemyStatPercents.atk[i];
 		for (var i = 0; i < enemyStatPercents.atkSpd.length; i++) totalAtkSpdPct += enemyStatPercents.atkSpd[i];
-		enemyStatGrowth.hp.push(Math.round(baseHp * (1 + totalHpPct)));
+		// After level 20, enemy health increases by an additional 50% per level
+		var extraHpMultiplier = 1;
+		if (lvl > 20) {
+			// For each level above 20, multiply by 1.5 for each extra level
+			extraHpMultiplier = Math.pow(1.5, lvl - 20);
+		}
+		enemyStatGrowth.hp.push(Math.round(baseHp * (1 + totalHpPct) * extraHpMultiplier));
 		enemyStatGrowth.atk.push(Math.round(baseAtk * (1 + totalAtkPct)));
 		enemyStatGrowth.atkSpd.push(Math.round(baseAtkSpd * (1 + totalAtkSpdPct)));
 	}
 }