It's a game I made in high school in like 2014 or 2015. Originally released as an iOS app, this is the original source code. The iOS app was just a wrapped HTML app because iOS was not fond of web apps at the time. Now it's a HTML5 app for everyone. Download The zip, play it online, or download the experimental Web Bundle version.
It was originally a fully copyrighted work, but is now available under GPL-3.0 so you can share or modify it for free.