Found it! Sadly, it looks like the itch page was pulled. Here's a backup of the original sales page:
https://web.archive.org/web/20170917043604/https://rodneylives.itch.io/atplay
But I found a version for sale here:
https://www.routledge.com/Exploring-Roguelike-Games/Harris/p/book/9780367482596