Interesting idea and good scene composition. As others have already mentioned, it's a bit difficult since the monster always wakes up. In the future,
if you continue with the development, it might be cool to add events that help you or the monster, such as some objects returning to their initial position unless you interact with something, or the monster entering a deep sleep.
As constructive criticism, consider adding a button or making the game return to the beginning when it ends, so you don't have to close the game and reopen it.
Nice entry for a solo dev, congrats!!!