So I was able to play in browser like a month ago, and now it runs, but doesn't show the navbar at the top with pause, play etc, and opening all the available menus just renders a blank page. I attempted to download for iOS and after unzipping the correct file, I get the error "cannot run [filename]" So I am unable to play at all :(

Hi,
Does your system support WebGL? You can check that here.
Have you tried a different browser?
Or, you may have better luck downloading the game this way instead.