i took a look and the gifs look ok to me! i don't think i saw any rapid bright flashing, so a gif toggle would be a nice bonus but not a requirement. :> would love to have you on there when you're done though!
yeah, for purely decorative images, alt="" (without any content between the quotation marks) is sufficient
I read something by someone with low vision saying that an empty alt tag made them think the person had just forgotten to leave an alt tag, while a null tag let them know it was something unimportant :0
https://veroniiiica.com/how-to-write-alt-text-image-descriptions-visually-impaired/
alt="" *is* the null attribute? leaving it blank would mean not tacking on the alt attribute in the first place.
i think this post was written for people posting on social media platforms that provide an alt text field (in other words, sites that aren't handcoded) - that's where writing "null" would make sense.
for the record that source was recommended to me, so I apologize if it turned out not to be what most people use!
went on neocities github to find thait its likely the jerk detecton, and i assume we did the same as i also found your github issue lol. πed it