===================================================================
--- original.js
+++ change.js
@@ -1,5 +1,10 @@
 /**** 
+* Plugins
+****/ 
+var tween = LK.import("@upit/tween.v1");
+
+/**** 
 * Classes
 ****/ 
 // test
 var ButtonBot = Container.expand(function () {
@@ -20,43 +25,35 @@
 		self.scale.set(0.9); // Add press effect by scaling down
 		if (!player.inAir && !player.doubleJump) {
 			player.rotation -= Math.PI / 2.25; // Rotate 80 degrees counter-clockwise
 		} else if (player.inAir || player.doubleJump) {
-			var jumpDuration = 100;
-			var jumpStartTime = Date.now();
-			var jumpInterval = LK.setInterval(function () {
-				var elapsed = Date.now() - jumpStartTime;
-				var progress = elapsed / jumpDuration;
-				if (progress >= 1) {
-					player.y = 2732 / 2 - 250;
+			tween(player, {
+				y: 2732 / 2 - 250
+			}, {
+				duration: 100,
+				onFinish: function onFinish() {
 					player.inAir = false;
 					player.doubleJump = false;
-					LK.clearInterval(jumpInterval);
-				} else {
-					player.y = player.y - 200 * progress;
+					player.y = 2732 / 2 - 250;
 				}
-			}, 16);
+			});
 		}
 		if (player.inAir || player.doubleJump) {
 			if (!player.hasRotated) {
 				player.rotation -= Math.PI / 2.25; // Rotate 80 degrees counter-clockwise
 				player.hasRotated = true; // Ensure rotation only occurs once
 			}
-			var moveDuration = 100;
-			var moveStartTime = Date.now();
-			var moveInterval = LK.setInterval(function () {
-				var elapsed = Date.now() - moveStartTime;
-				var progress = elapsed / moveDuration;
-				if (progress >= 1) {
-					player.y = 2732 / 2 - 250;
+			tween(player, {
+				y: 2732 / 2 - 250
+			}, {
+				duration: 100,
+				onFinish: function onFinish() {
 					player.inAir = false;
 					player.doubleJump = false;
+					player.y = 2732 / 2 - 250;
 					player.hasRotated = false; // Reset rotation flag
-					LK.clearInterval(moveInterval);
-				} else {
-					player.y = player.y - (player.y - (2732 / 2 - 250)) * progress;
 				}
-			}, 16);
+			});
 		} else {
 			player.hasRotated = false; // Reset rotation flag if not in air or double jump
 		}
 	};
@@ -90,70 +87,53 @@
 		self.scale.set(0.9); // Add press effect by scaling down
 		if (!player.doubleJump || player.inAir && !player.doubleJump) {
 			if (player.inAir) {
 				player.doubleJump = true;
-				var doubleJumpDuration = 100; // Reduced duration for lower double jump height
-				var doubleJumpStartTime = Date.now();
-				var doubleJumpInterval = LK.setInterval(function () {
-					var elapsed = Date.now() - doubleJumpStartTime;
-					var progress = elapsed / doubleJumpDuration;
-					if (progress >= 1) {
-						player.y = player.y - 300;
-						player.rotation -= Math.PI * 2;
-						player.inAir = true;
-						LK.clearInterval(doubleJumpInterval);
-						var fallDuration = 400; // Reduced duration for quicker fall
-						var fallStartTime = Date.now();
-						var fallInterval = LK.setInterval(function () {
-							var fallElapsed = Date.now() - fallStartTime;
-							var fallProgress = fallElapsed / fallDuration;
-							if (fallProgress >= 1) {
-								player.y = 2732 / 2 - 250;
+				tween(player, {
+					y: player.y - 400,
+					rotation: player.rotation - Math.PI * 2
+				}, {
+					duration: 230,
+					easing: tween.easeInOut,
+					onFinish: function onFinish() {
+						player.inAir = true; // Allow another jump
+						tween(player, {
+							y: 2732 / 2 - 250
+						}, {
+							duration: 800,
+							onFinish: function onFinish() {
 								player.inAir = false;
 								player.doubleJump = false;
-								LK.clearInterval(fallInterval);
-							} else {
-								player.y = player.y - 200 * (1 - fallProgress);
+								player.y = 2732 / 2 - 250;
 							}
-						}, 16);
-					} else {
-						player.y = player.y - 300 * progress;
+						});
 					}
-				}, 16);
+				});
 				return;
 			}
 			player.inAir = true;
 			player.doubleJump = false;
 			player.lastY = player.y; // Update lastY immediately after jump initiation
 			player.lastX = player.x; // Update lastX immediately after jump initiation
 			player.lastY = player.y; // Update lastY immediately after jump initiation
 			player.lastX = player.x; // Update lastX immediately after jump initiation
-			var initialJumpDuration = 50; // Reduced duration for lower jump height
-			var initialJumpStartTime = Date.now();
-			var initialJumpInterval = LK.setInterval(function () {
-				var elapsed = Date.now() - initialJumpStartTime;
-				var progress = elapsed / initialJumpDuration;
-				if (progress >= 1) {
-					player.y = player.y - 300;
-					player.inAir = true;
-					LK.clearInterval(initialJumpInterval);
-					var fallDuration = 400; // Reduced duration for quicker fall after double jump
-					var fallStartTime = Date.now();
-					var fallInterval = LK.setInterval(function () {
-						var fallElapsed = Date.now() - fallStartTime;
-						var fallProgress = fallElapsed / fallDuration;
-						if (fallProgress >= 1) {
-							player.y = 2732 / 2 - 250;
+			tween(player, {
+				y: player.y - 400
+			}, {
+				duration: 100,
+				// Reduced duration to allow quicker second jump
+				onFinish: function onFinish() {
+					player.inAir = true; // Allow another jump
+					tween(player, {
+						y: 2732 / 2 - 250
+					}, {
+						duration: 800,
+						onFinish: function onFinish() {
 							player.inAir = false;
-							LK.clearInterval(fallInterval);
-						} else {
-							player.y = player.y - 200 * (1 - fallProgress);
 						}
-					}, 16);
-				} else {
-					player.y = player.y - 300 * progress;
+					});
 				}
-			}, 16);
+			});
 		}
 	};
 	// Add up event to reset scale
 	self.up = function (x, y, obj) {
@@ -174,14 +154,8 @@
 	self.hasRotated = false; // Initialize rotation flag
 	// Initialize lastY and lastX for tracking changes
 	self.lastY = self.y;
 	self.lastX = self.x;
-	// Add boundary check to prevent player from moving off the top of the screen
-	self.update = function () {
-		if (self.y < 0) {
-			self.y = 0; // Prevent moving off the top
-		}
-	};
 });
 
 /**** 
 * Initialize Game
@@ -440,19 +414,15 @@
 domImage.rotation = Math.PI / 9; // Rotate image by 20 degrees clockwise
 domImage.alpha = 0.2; // Set transparency to 50%
 domImage.blendMode = BLEND_MODES.NORMAL; // Ensure transparency does not sum up
 // Add a glow effect to the 'Dom' image
-var glowDuration = 1000;
-var glowDirection = 1;
-var glowStartTime = Date.now();
-var glowInterval = LK.setInterval(function () {
-	var elapsed = Date.now() - glowStartTime;
-	var progress = elapsed % glowDuration / glowDuration;
-	if (progress >= 1) {
-		glowDirection *= -1;
-	}
-	domImage.alpha = 0.2 + 0.8 * progress * glowDirection;
-}, 16);
+tween(domImage, {
+	alpha: 0.2
+}, {
+	duration: 1000,
+	yoyo: true,
+	repeat: Infinity
+});
 // Add image 'niz' to the bottom of the screen
 var niz = game.addChild(LK.getAsset('NIZ', {
 	anchorX: 0.5,
 	// Center horizontally
@@ -536,21 +506,18 @@
 }));
 ball.x = ball.width / 2 - 100; // Shift ball 100 pixels to the left
 ball.y = 2732 / 2 - 300; // Center ball vertically
 LK.setTimeout(function () {
-	var moveDuration = 360;
-	var moveStartTime = Date.now();
-	var moveInterval = LK.setInterval(function () {
-		var elapsed = Date.now() - moveStartTime;
-		var progress = elapsed / moveDuration;
-		if (progress >= 1) {
-			ball.x += 400;
-			ball.destroy(); // Remove the ball after it moves 400 pixels
-			LK.clearInterval(moveInterval);
-		} else {
-			ball.x += 400 * progress;
+	tween(ball, {
+		x: ball.x + 400
+	}, {
+		duration: 360,
+		// Reduced duration to double the speed 
+		easing: tween.linear,
+		onFinish: function onFinish() {
+			ball.destroy(); // Remove the ball after it moves 200 pixels 
 		}
-	}, 16);
+	});
 }, 1500);
 game.down = function (x, y, obj) {};
 var player = game.addChild(new Player());
 player.x = player.width / 2 + 200; // Position player 200 units to the right of the center left of the screen
@@ -632,10 +599,14 @@
 	game.children.forEach(function (child) {
 		if (child !== player && child !== buttonTop && child !== buttonBot && child !== uskorenie) {
 			// Check for intersection with prep or prepf objects
 			if ((prepImages.includes(child.assetId) || prepFImages.includes(child.assetId)) && player.intersects(child)) {
-				LK.setScore(LK.getScore() + 1); // Increment score
-				scoreText.setText(LK.getScore().toString()); // Update score display
+				if (child.assetId === 'Prep1') {
+					LK.showGameOver(); // Trigger game over if player intersects with Prep1
+				} else {
+					LK.setScore(LK.getScore() + 1); // Increment score
+					scoreText.setText(LK.getScore().toString()); // Update score display
+				}
 			}
 			if (child === domImage) {
 				if (child.lastX === undefined) {
 					child.lastX = child.x;