Nice! Some feedback from my wife, who is into all manner of word games: she found it a little bit brute-forcey: needing to try all different combinations in order to get the right configuration of the word. In contrast to a crossword where there is already a layout, which gives her a hint for how to proceed with the rest.

(She finished today's puzzle, and I gave up.) From a UI perspective it is very slick - very smooth, and I like how it kind of "gets" what you were trying to do when providing corrections/hints.