I am having a lot of fun with your game, so thank you for that :-) However there's one small annoyance I want to mention.
I hardly ever like games being translated to my own language, I'd rather keep it in English. However, you switch language at the start automatically. I'd get rid of that and make it optional. Additionally, when I go to the settings before your language files are loaded (I assume) the language selection remains empty and I have to refresh the page to make it work again.