Awesome game! One thing I wished for was for punctuation support in the word guesser, because there were a few words I was unsure of and I would've liked to have put (???) after uncertain words, just as a marker for myself. There were a few words I didn't get, but I made it through fine. I like how you had the locked room, but it was completely empty. The value wasn't the room, but rather the confirmation that those words forming the code were correct. Very smart stuff!
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Some inbuilt system could be used though I personally like the idea of making my own lexicon of meanings through punctuation. That could disrupt the flow of your dialogue though, and if you want to have actually important punctuation like a question mark, that could be less obvious due to whatever punctuation the player added. I think either way could work, down to your preferences.