Local storage issues

Hi!

It's my first time using local storage and i'm using it for my game to know - if a player will play the game for the first time or not

(the layout should turn purple if its your first time, and will show boxes of green if its no longer your first time)

So here's my issue , this works PERFECTLY FINE in the debugging layout and exported NW.js format BUT not in a HTML5 format. WHY?

I have uploaded this in itch.io in a HTML format but for some reason its not working. You can try it here:

jaytee.itch.io/test-4

Any suggestion would be very helpful! Thank you..