Thank you very much for your kind words and taking the time to try out the game. I think you are my first player and this the first user feedback. Feels nice! :D
What a great idea. I think these enemies could just simply spawn somewhere and slowly creeping in the direction of the fire, therefore making it harder for the player to navigate. When these creepy enemies get too close to the fire and the fire still has let's say more than 20% intensity, then they disappear, otherwise they could just linger there and block the players way.
In my design document, I actually had another optional feature planned, which was to have a dog come in from time to time and steal a stick, also making it harder for the player to find sticks with which to stoke the fire.