Several improvements

game.js

@@ -1,12 +1,11 @@
 class Game {
     constructor(container) {
         this.elements = {
-            highscore: container.querySelector('#highscore'),
             score: container.querySelector('#score'),
-            coinCount: container.querySelector('#coin-count'),
             pauseBtn: container.querySelector('.play-btn'),
             pauseMenu: container.querySelector('#pause-menu'),
             gameOverMenu: container.querySelector('#game-over-menu'),
+            speedUpContainer: container.querySelector('.speed-up-container'),
         };
 
         this.canvas = container.querySelector('#canvas');
@@ -61,10 +60,12 @@ class Game {
         });
 
         this.canvas.addEventListener('mouseup', (e) => {
+            if (this.mousePos) {
                 this.mousePos = cbRelMousePos(e);
                 this.shoot().then(() => {
                     this.mousePos = null;
                 });
+            }
         });
 
         this.elements.pauseBtn.addEventListener('click', () => {
@@ -246,7 +247,7 @@ class Game {
                     powerUp.remove();
                 });
             }
-        })
+        });
     }
 
     increaseRoundNumber() {
@@ -256,12 +257,11 @@ class Game {
     }
 
     increaseCoinCount() {
-        coinCount++;
-
-        this.elements.coinCount.innerText = coinCount;
+        setCoinCount(coinCount + 1);
     }
 
     update() {
+        for (let i = 0; i < this.speed; i++) {
             this.balls.forEach(ball => {
                 ball.update(10);
             });
@@ -295,7 +295,7 @@ class Game {
         this.increaseRoundNumber();
         this.addNewObjects();
         this.shiftObjectsDown();
-        this.play()
+        this.play();
     }
 
     play() {