After spending a few minutes playing it, I came out with the feedback below:
It would be nice if you added some sound effects for "hits" and "misses".
For better dynamics, consider varying the words length. It appears to me that you are serving only words with five letters.
It appears that you are having a bug that prevents the game from running smoothly on the following browsers: Firefox (Windows) and Brave (Windows/Android). I tried other browsers/OSes and the game was running perfectly: Chrome/Edge (Windows), Safari (iOS) and Firefox (Android). Apparently, the script at "https://cloud.umami.is/script.js" is not being loaded which causes an exception to happen when you lose; this prevents the game to show "Try Again" and the screen goes blank instead where you have to refresh the page to play again.
And about adding sound effects: only if they can be turned off easily.
Or if you mean the player's task, that's not finding anagrams either: you just need to choose the nonword that has the same counts of the letters as the word.
Seeing some of the other comments reminded me that most of the work went into trimming the word lists so that it wasn't rude or randomly impossibly difficult.
Psychologically I find myself wanting to see which word I missed, much in the same way that I involuntarily want to look back at the crack in the sidewalk I tripped over.
Fun little spin on the game though.