First off; the music is absolutely banging. Top notch. I also like the addition of a timer on each level; it sets the urgency of the situation at hand. Having a small bar, or a clearer indication, of how much the fire has been extinguished would be very helpful in balancing how much water should be used or conserved.
All in all, it was a very satisfying game to play. It has a lot of potential to be expanded on!