Hey. Great app. Came across the word LET'S in the 5 letter version. Unsure if recent updates have removed this word/words with apostrophes. Cheers. 
Viewing post in Added more word sizes and linux build comments
I uploaded a new build on the main page a few days ago that fixes this problem I think If you downloaded from the devlog post that might be the old build. Here is the main page: https://josfeld.itch.io/word-game