In short, it's a home-made flash player that I've tailor-made to play my animations spanning back to 2015. It runs on Flash's own .exe/.app and AIR's .apk "projector" files to run, meaning you don't need anything installed to play them.
All of the files needed, besides the app itself, is hosted on a web server; this one to be exact! The app asks for a file on the server that lists all my current animations in a file then loads the objects off of that file and presents it to you as a menu. Once you click on the flash it presents it takes the URL loaded from that animation, loads it into the app, and presents it to you. This means that I can dynamically update the file it reads online, so as long as you have an active internet connection you will ALWAYS have access to the app. Using a "projector" file as an export choice means that this flash animation has its own baked in player of sorts, and thus means that you don't need flash installed to run or load the app.
These are the current bugs I'm aware of:
Current fix: Try reloading the app again, it should work. If you suspect the file is down just message me on Twitter.