Snake can accelerate

levels/2.json

@@ -1,4 +1,6 @@
 {
+    "minDelay": 100,
+    "acceleration": 1,
     "dimensions": [40, 40],
     "delay": 200,
     "walls": [

script.js

@@ -134,12 +134,13 @@ async function startGame(gameID) {
      * I placed this function here to inherit
      * the map, snake, canvas & ctx variables...
      */
-    let interval = setInterval(() => step(), level.delay);
+    let currDelay = level.delay;
+    setTimeout(() => step(), currDelay);
     function step() {
         
         // Check if a game was destroyed
         if(!canvas.isConnected)
-            clearInterval(interval)
+            return;
 
         // Move the snake if required
         if(key) {
@@ -261,13 +262,18 @@ async function startGame(gameID) {
 
             }
         }
+
+        if(level.hasOwnProperty("acceleration"))
+            currDelay -= level.acceleration;
+        if(level.hasOwnProperty("minDelay") && currDelay <= level.minDelay)
+            currDelay = level.minDelay
+        setTimeout(() => step(), currDelay);
     }
 
     /**
      * Call this function once the user loose the game
      */
     function gameOver() {
-        clearInterval(interval);
         alert("Game over !!!");
         location.href = "#";
     }