I posted it twice already in this thread, but I guess third time's the charm: http://jacek.zlydach.pl/v/2048/ (code: https://git.sr.ht/~temporal/aider-2048).

It's definitely not 100% correct (I just spotted a syntactic issue in HTML, for example), and I bet a lot of people will find some visual issue on their browser/device configuration. I don't care. It works on my desktop, it works on my phone, it's even better than the now-enshittified web and Android versions I used to play. I'm content :).