i would execute it manually but it looks like it's an html file with a javascript thingy ... my guess is that is the actual game.
im currently unaware of how i would execute this outside of a browser which opening it in firefox doesn't seem to yield very much.
i suspect i'd have to setup some kind of server to get the permissions correct maybe?
but i don't have the knowledge to execute that plan without potentially messing up my already running server.