Update to every 5 lines = new level

index.html

@@ -601,7 +601,7 @@
             linesClearedTotal += rowCount;
 
             // Level Up Logic: Every 8 rows
-            if (linesClearedTotal % 6 === 0) {
+            if (linesClearedTotal % 5 === 0) {
                 levelUp();
             }
         }