I like the concept. I think the game was a bit too easy though. I would have loved to see some kind of twist to make it more challenging. Either that you have to more tactically plan your fire to make it spread as much as possible, or that the firetruck could extinguish multiple fires in an area at a time so maybe you'd have to start fires in multiple different spots.
The art looks really crisp and clean, and the level transition was really smooth.
Well done! :)