A great take on the theme, reminds me of a Ludum Dare 50 game that scored within the top ratings. Nice graphics and mechanics. I found several little glitches/bugs that, on their own, are small, but on the whole hinder a little bit of the experience (water sound looping, horizontal acceleration a bit high, tutorial text could not be dismissed, one time the player fell outside the level etc.). The most frustrating one was that the fire and water collision masks are a bit finicky, so I could be standing right next to the flame aiming the water at the base and it wouldn't put out the fire at times. Also, it wasn't really clear that you did not have to actually guide people out of the level after cooling them, so I was stuck for a bit on the first level to save people.