This game has so much character! I really enjoyed its sense of humor, art style, and music. I appreciated the tutorial was included as the opening section of the game. Mechanics were taught very naturally.
My biggest feature suggestion would be to add a way to clear an entry from your notebook. There were times where I was putting symbols in the wrong spot and wanted to set the circle to blank once I realized my mistake. As far as I could tell, there isn’t a way to do this.
Great job and keep making stuff!