Very nice idea and challengine puzzles! I would improve the visibility of the selected character. The area on which you can click to select it is small, so I ended up deselecting the character sometimes. It would be maybe nice with "Tab" or other key to switch between characters? Gameplay might be way faster then ;)
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I agree with the visibility. The area to click on the people should be even a square around the character, which should be easy to click if you are in full screen. The tab suggestion is interesting, though I don't know how well it would work in the later levels with more than 2 people. I'm glad you enjoyed the game!