Hi Okoyos, thanks for playing! I caught that bug too just after submitting, but haven't quite tracked it down yet. It seems to happen fairly rarely, so hopefully it's not game-breaking for most.
Agree that the game needs some balancing -- those insta-kill critical hits from tougher monsters are brutal, and are pretty unfair. I need to add wearable armor, and also add some mitigation strategies to reduce the chance of getting critted.
Thanks again, really appreciate you taking the time to play and provide feedback.