This is surprisingly complete... it has i18n support, uses webpack [1], ES6, sound, I can't find any gameplay mechanics that are missing...

Good job. I can't help to be a little envious they were able to find time to build this.

[1] I personally don't like webpack but to each their own

There's something quite... strange... about showing off how you can use your framework to reimplement games from the 1980s that ran on computers millions of times slower than modern computers.

Tetris is my go-to and my #1 recommendation when someone asks how to get into game programming. It's such a simple game conceptually but surprisingly difficult to actually implement.

I've never tried building a Tetris but if it's as difficult as you say, I guess this must be doubly impressive https://gist.github.com/aemkei/1672254

It all depends on how much of the gameplay mechanics you implement. That implementation has very few of the gameplay mechanics.

Still very impressive none-the-less... I bet most coders couldn't do tic-tac-toe in that little code.

Nice. Just played it. Works perfectly.