[SOLVED] How to load all images before the game starts? (JavaScript, Preloader)

I've designed this game, it's my first project. It's a spin-off from "The Pig Game" in a JavaScript course. I tweaked the HTML and CSS templates of the Pig Game for the UI, but I did the game design and coding from scratch. You can play the game here: https://jeffparadox.000webhostapp.com/

I've got some questions, if anyone cares:

What do you think, do you see any problems? Can anything be clearer (especially in terms of UI) than it is now?
Game works fast on my comp. But when I visit the site, images don't start spinning right away; it takes about 30 seconds to start seeing images spin visibly. I think it's because the browser is loading the images but the code runs faster. Is there a way to pre-load these images in the code, so the game starts properly? Or, if I clean up my code, will the game load faster without needing to pre-load the images?
Here's my JS code. If anyone's interested in checking it and telling me which parts I can clean-up and optimize, I'd really appreciate it. Thanks in advace:

"use strict";

// Selecting elements
const player0El = document.querySelector(".player--0");
const player1El = document.querySelector(".player--1");
const tries0El = document.getElementById("tries--0");
const tries1El = document.getElementById("tries--1");
const current0El = document.getElementById("current--0");
const current1El = document.getElementById("current--1");

const animalEl = document.querySelector(".animal");
const btnSpin = document.querySelector(".btn--spin");
const btnReset = document.querySelector(".btn--reset");
const btnRestart = document.querySelector(".btn--restart");

const youWin0El = document.querySelector("#you-win--0");
const youWin1El = document.querySelector("#you-win--1");

const highScore0El = document.querySelector(".high-score--0");
const highScore1El = document.querySelector(".high-score--1");

// Declare let variables
let triesLeft,
  playerScores,
  highScores,
  activePlayer,
  round,
  currentScore,
  playing;

// Starting conditions
const init = function () {
  youWin0El.classList.add("hidden");
  youWin1El.classList.add("hidden");
  youWin1El.textContent = "You Win! 🎉";
  youWin0El.textContent = "You Win! 🎉";
  currentScore = 0;
  triesLeft = [10, 10];
  playerScores = [0, 0];
  highScores = [0, 0];
  activePlayer = 0;
  round = 3;
  playing = true;

  btnRestart.textContent = `🕑 ROUND: ${round}`;

  tries0El.textContent = 10;
  tries1El.textContent = 10;
  current0El.textContent = 0;
  current1El.textContent = 0;

  animalEl.src = "noAnimal.jpg";
  player0El.classList.remove("player--winner");
  player1El.classList.remove("player--winner");
  player0El.classList.add("player--active");
  player1El.classList.remove("player--active");
};

// Initialize game
init();

// ***GAME FUNCTIONS***

// Switch players
const switchPlayer = function () {
  activePlayer = activePlayer === 0 ? 1 : 0;
  player0El.classList.toggle("player--active");
  player1El.classList.toggle("player--active");
};

// Check how many rounds left
const checkRound = function () {
  btnRestart.textContent = `🕑 ROUND: ${round}`;
  if (round < 1) {
    gameOver();
  } else if (triesLeft[activePlayer] < 1 && round > 0) {
    if (triesLeft[0] === 0 && triesLeft[1] === 0) {
      triesLeft[0] = 10;
      triesLeft[1] = 10;
      tries0El.textContent = 10;
      tries1El.textContent = 10;
    }
    switchPlayer();
  }
};

// End of game
const gameOver = function () {
  playing = false;
  if (playerScores[0] > playerScores[1]) {
    youWin0El.classList.remove("hidden");
  } else if (playerScores[0] < playerScores[1]) {
    youWin1El.classList.remove("hidden");
  } else if (playerScores[0] === playerScores[1]) {
    youWin1El.textContent = "It's a Tie 😲";
    youWin0El.textContent = "It's a Tie 😳";
    youWin1El.classList.remove("hidden");
    youWin0El.classList.remove("hidden");
  }
};

// Check the rabbit, increase and log the score
const checkRabbit = function () {
  if (imageNumber === 0) {
    currentScore =
      Number(document.getElementById(`current--${activePlayer}`).textContent) +
      1;
    playerScores[activePlayer] = currentScore;
    document.getElementById(
      `current--${activePlayer}`
    ).textContent = currentScore;
  }
};

// Update tries left
const triesUpdate = function () {
  triesLeft[activePlayer] -= 1;
  document.getElementById(`tries--${activePlayer}`).textContent =
    triesLeft[activePlayer];
};

// Update high scores
const registerHighScore = function () {
  if (playerScores[activePlayer] > highScores[activePlayer]) {
    highScores[activePlayer] = playerScores[activePlayer];
    document.getElementById(
      `high-score--${activePlayer}`
    ).textContent = `High Score: ${highScores[activePlayer]}`;
  }
};

// ***GAME ENGINE***

// Declare game engine variables
let interval, imageNumber;

// Spinning images
btnSpin.addEventListener("click", function () {
  if (playing) {
    // Change button to Stop
    btnSpin.textContent = `⛔ STOP!`;
    // Stop the spinning (Runs only when interval is declared)
    if (interval) {
      clearInterval(interval);
      interval = null;
      btnSpin.textContent = `🎰 SPIN!`;
      triesUpdate();
      checkRabbit();
      registerHighScore();
      if (triesLeft[0] < 1 && triesLeft[1] < 1) {
        round -= 1;
      }
      checkRound();
      // Start the spinning (Runs only when interval is null or undefined)
    } else {
      // Loop with time intervals
      interval = setInterval(function () {
        // Genarate image number
        imageNumber = Math.trunc(Math.random() * 10);
        // Show image with the generated number
        animalEl.src = `animal-${imageNumber}.jpg`;
      }, 5);
    }
  }
});

// ***RESET GAME***
btnReset.addEventListener("click", init);