It wasn't very intuitive at first that you need to double click the monster to earn XP or that there even was XP in the first place. Once I figured it out the puzzle of looking for monster that won't overshoot my health was quite fun. I managed to kill Cthulhu after a couple attempts.
Unfortunately, all sfx were very noisy/glitchy on my computer to the point I had to mute the game, but from what I was able to hear they would fit well with the game and even heighten the tension.
What I did not enjoy was dying on a first move. Also I couldn't understand before I finished the game why central location was an instant death.