An interesting idea! It took a moment to get a hang of it, but after it clicks it’s pretty fun to watch everything unfold.
My problem with it is that it sometimes gets pretty laggy. For seemingly no reason, it doesn’t react to me clicking a tile, and a few seconds later it clicks another one on its own. It also lags out a lot when you click an exploding tile and the chain reaction sets a lot of tiles alight.
One way I can see this be improved is to make the fire burn a lot longer. Right now, when you set the first tile on fire you only have around a second or two before the game ends (if you don’t put another fire in the field). Having it burn longer would give the player some time to think about their next move instead of clicking nearly instinctively.
Overall, a nice idea for a game. I liked it. ;)