Oh! That worked much better on mobile via requesting desktop.

The readability definitely improved when using the buttons. I still ran into my usual difficulty parsing l and I, but the dbpqg part was almost non existent. So I think you got the spacing down right. As weird as it may seem, the font of the regular version has enough difference between i and l that those show clearer for me than in the dyslexic assist version, though the other letters are better in the assist.

Looking at it on my laptop is solid. The only thing I might suggest is labelling buttons instead of mouseover, or increasing the size so that they're a bit more obvious as buttons for us old farts that need reading glasses lol.

The colorblind contrast setting actually improved readability of the text for me as well. There's something about the background that ever so slightly distorts the lettering, though I have no clue why that is.

But, on the laptop, the letter readability was roughly the same, with the difference in screen quality making way more of a difference than anything about the fonts or spacing

Honestly, It's way better readability on either device (tablet and latop) than most sites.

It's fucking brilliant to see someone putting in the time to work on this :)