A "Hidden in Plain Sight" style game was on my list of ideas for the jam, so I'm pleased to see it implemented so well! Perhaps a "movement meter", which limited the amount you could move, would increase the challenge by forcing the player to be more cautious, as when I played I spammed buttons and scanned across the screen to identify the True Ninja.

Nice Idea, would like a more polished version that expands on the current elements. Maybe a goal that is different than just clicking could be nice too. I really liked it!

Well executed game without bugs. Its a really interesting concept, however it doesnt keep you attention for very long.

A quality of life feature would be being able to kill the wrong ninjas.