At the top it says how many boards are solved. I'd coppy that info at the bottom so it's easier to find.

It shoulb be always solvable in 26×5=130.

Feature requests:

Important! Save the state in a cockie, in case the user refresh the page. (Don't ask.)

Perhaps make the header always visible.

Perhaps make the new word always visible.

Perhaps show a star moving across the screen for every word that is solved.