I love, love, love the idea of this game. I was very excited to play this one to the point where I wanted it to be one of the last ones I played in anticipation of any changes. The art style is very cute, and the sound design/music is phenomenal. It's a pleasant environment for sure. The twist of the game is also extremely unique, I appreciated it very much.
The gameplay could certainly be smoother, though. The A was wrong, which left me in the lurch when Koakuma moved on her own to attack an enemy (which was not something I knew could happen) and allowed Wriggle to steal a book. I also had to mess with the input delays a lot because the initial settings were very unforgiving. I spent about 15 minutes on the tutorial, if not more, trying to make a word. I think some simple changes to ramp down difficulty could have helped; the intention behind the word system was appreciated to keep the Morse code bit authentic, but considering you're asking the player to literally learn it to play, perhaps flexibility would help. For instance, allowing orders to be the letters in sequence would get the point across since there's so much time between enemies and it would read much the same the same. (i.e.: If you type BC, Sakuya reacts, then you can confirm with instructions or K to kill the message-- or you could designate #8 as a space and let the player use separate letters and K at the end.) Also, there's an over-reliance on C as a letter between the players and the rooms; perhaps using H for the hallways would work better there.
The only other thing I noted could be fixed is the dictionary laying over a third of the map. If there was a way to fit both things on the screen at the same time, it would be more fair to the player. I do like IllusoryBread's idea about the meter; it was hard to tell when the game was reading a dit or a dah.
I know this reads as potentially over-critical, but I love this game so much I want to see it at its best. I think some small changes would put this over the top. This is probably one of my highest-rated games in the Jam on pure audacity alone. Congrats on making a great game!