Looks great. And I think that I need to get people wet! Other than that there wasn't really any challenge in the game.
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Look, I thought people might be wet. (Beware, SPOILERS for the second version)
(I had such an idea (here comes the challenge) and that was if you wet people too much, they will disappear. You have to let them dry and then again you can moisten. When they get too wet, they disappear. And when no one is left, the end. And you're starting again.)