so, essentially, its a top-down shooter where you protect a campfire, but you shoot out coal, and there's a short cooldown, so there will be slow enemies, but the fire also has to have coal to keep it on.
Sounds Nice! Sounds Better, but Remember the only item you have that is multi-use is coal. I would recommend a currency made out of paper that you can burn or use to buy. The campfire gives you X amount of cash and changes X by a number. And if it turns off you have 20 seconds to revive the fire with a lighter which you can purchase from the shop with the currency. I KNOW I am complicated and sometimes dumb, but this feels right.