A very well done tutorial, didn't manage to break it! :P Though it seems you can prep a little bit before the creature is revealed but I guess it's intended.
The game mechanics and the gameplay are well explained and easy to understand.
One thing to improve the game: Have an icon other than "O" displayed when the game is started so the player understands which key it actually is because I had to go in the itch page to figure out the controls and not everyone has this patience and can quit the game with all its potential.
Other than this small things it seems you have good game design foundations, I truly enjoyed the game!