Sorry I don't know as I am not the author. I found the game on twitter and posted here. Omar Wagih is the author (https://twitter.com/omarwagih)

Oh! I should have searched it before posting.

Not at all! reposts are ok after a year: https://news.ycombinator.com/newsfaq.html. These links to past threads are just for readers who like to read past threads.

Excellent site! Thank you.