I was confused at first, because I saw this post less than an hour after it went up, but the game wasn't free. Then I read the top post by developer and found that the game is free with ads through some other site/service called "Playmanity".
Here's a direct link.
https://knowyourmeme.com/memes/programming-socks
TL;DR: It all seems to have started with a (possibly deliberately) misnamed pair of socks for sale on Amazon. They began showing up as suggestions when people searched for programming-related items.