Thank you so much for getting back to me. I downloaded blender 2.8 beta yesterday, downloaded the zip, and attempted to install it through the addons. I tried again today (downloaded a fresh version of 2.8 on my mac, yesterday I tried this on my windows machine), downloaded your add on, installed from blender. I see at the bottom it says that it was installed. Neither of us were able to get it to display in the addons list.
Sorry, I've got what went wrong. Once you download the repository first unzip it, rename the unzipped folder to "sprytile" and zip it again. (On windows, if you double click on the new zip you should see the "sprytile" folder, and the python scripts should be inside it). Then try installing that zip. I've tested it on a fresh install and it worked :)