Blimey!  After I engaged reader mode, all was revealed 8)  

The "spider" and the wandering particles are funky but everything else in gthe presentation conspires to exclude granddad (who has rather shite eyesight these days). On the bright side, you didn't go for a dark theme. I'm happy to sort out my very minor accessibility "problems" but it might be nice to cater for all, as much as you can.

I love how you have considered so many ways to ensure that it will degrade gracefully, as far as is possible for certain glyph handling capabilities.

Good skills ... how on earth does this work? I pasted your glyph quite a lot and found that backspace changes it into the other flag:

EDIT: Oh dear, HN strips out funky glyphs so this post looks a bit odd.