The contrast on a lot of the text is very low. Especially in the popup with the rules.

I got a 581. ("Sharpshooter!") I felt like I was "nerd sniped"... I felt like I really need to see if I could find more words!

   https://xkcd.com/356/

It'd be nice if the results page told me which of my words was the rarest. [Or maybe it did and I just didn't notice?] Also, it took me a while to realize that I didn't have to use one letter from each column. :)