Great idea, great execution. Not sure why I should be saving people. It seems that the victory condition is no fires and some trees still standing.
I was missing some audio affordances about what the helicopter was doing (filling up with foam/water/people, dropping foam/water/people). It was also hard to tell where there was still fire to extinguish.
I'm impressed you made a tutorial in this short time.
I think there was too little control from dumping the water/foam. The helicopter movement was also a little floaty for my taste.