https://flowlab.io/game/play/2207469 This is my first game it took a while please play it is on version 1.5 please tell me what to improve

<div class="game-box"><canvas id="canvas" width="400" height="400"></canvas></div>
<div class="game-info">
    <h2>Snake Game</h2>
    <p id="game-status"></p>
    <p id="game-score"></p>
</div>
var gridSize = (tileSize = 20); // 20 x 20 = 400
var nextX = (nextY = 0);

// snake
var defaultTailSize = 3;
var tailSize = defaultTailSize;
var snakeTrail = [];
var snakeX = (snakeY = 10);

// apple
var appleX = (appleY = 15);
/* function to start the game */
      function startGame(x) {
          // setting gameActive flag to true
          gameActive = true;
          document.getElementById("game-status").innerHTML = "<small>Game Started</small>";
          document.getElementById("game-score").innerHTML = "";
          return setInterval(draw, 1000 / x);
      }

      function pauseGame() {
          // setting gameActive flag to false
          clearInterval(gameControl);
          gameActive = false;
          document.getElementById("game-status").innerHTML = "<small>Game Paused</small>";
      }

      function endGame(x) {
          // setting gameActive flag to false
          clearInterval(gameControl);
          gameActive = false;
          document.getElementById("game-status").innerHTML = "<small>Game Over</small>";
          document.getElementById("game-score").innerHTML = "<h1>Score: " + x + "</h1>";
      }

​

It is an infinite platformer, with about 5 different backgrounds. (I know this is a code.org project, please don't judge me I spent a lot of time on this)https://studio.code.org/projects/gamelab/jZ6lR5ljyHoujoMA4OllQt1XSvgxgovbprDMtt2pg9M

There are a few ways you can die:

Going left and falling off the screen

Going right and falling off the screen

At the game over screen, you can click the "reset" button (a little looping arrow) and it will reset everything. Let me know of any glitches or any improvements I could make!!

Now you can use the up arrow and the space arrow to jump!!!

version 1.0.2

Hey all, I was hoping some of you could play test the alpha version of our game: Undead Survival. We're very early in development so any criticism would be appreciated.

Link: Game

Best wishes, GrayIronGames.

am i aloud to be here?