The concept in really neat !
The visuals and sound design are really nice too (I'm especially fond of the animation where you... well... condemn an innocent)
The 20 seconds limit made it pretty hard though, I haven't managed to clear 4 rows once during the time limit even though I played in human mode
I had a hard time with the controls as I kept eliminating people I didn't intend to pick, but maybe that's a skill issue on my part