I like this, its a really neat little action puzzler. The graphics, audio and everything gives the game a nice little atmosphere.
The thing that is really holding it back for me is polish. The people you rescue just kind of sit in the water, where a nice little float animation would have been really nice.
Similarly, a liquid puzzler without a water animation seems odd. I would have really liked to see something, even if it was only a few frames.
Allowing me to waste charges clicking on things that I can't interact with isn't great either. Maybe add some sort of feedback for a bad click?
I'd really like to see this get more love and attention, there's a good core idea here.