Glad you love it! You should be able to download the zip file from this page, then unzip it into a folder on your computer. After that you can open FreshmenPhysicalEducation.exe in that folder to launch the game.
It might be easier to do via the Itch.io app, you can just go to the Freshmen page on the app, click install, and when it's installed, click Launch to open it. The app can be downloaded here: https://itch.io/app