Sorry about that - looks like I need to find a better way of making executables. You could try this: http://versificator.net/portcullis/portcullis.zip - unzip it to a fresh folder and open index.html . Unfortunately Windows 10 security is blocking that for me as well, but your mileage may vary. I'm as certain as I can be that it's clean, unless something's gone very wrong at my hosting provider.
Thank you so much for your support. I'll look for a better way of making offline playables.