Great concept, something I haven't seen before.
I'd like to see some better feedback when you do get the bad guys. That intermittent reward that tells the players brain "good job".
I would love to see some subtle distinguishing marker that would let the brain recognize the bad guys easier. Right now you have to look too closely. Something that would contrast them from the good guys, like a much darker image, contrasting color, varied saturation compared to the other images, something like that. It's hard to memorize their positions so quickly without simpler cues to tell the brain who's good and who's bad.
The game play is a little slow.
The music hurts my ears.
Thanks for making the game. I know it was a lot of hard work.