I really liked it. It was so SO satisfying when I managed to chain four or five kills by shooting out of the slow-mo. I liked the simple sprites and the time element also made it way more fun! I think the only thing you should work on is the fact that you should make the player eliminate all of the workers before being able to go into the next stage (I was able to just shoot myself inside the elevator by accident and leave some workers alive behind). The main art is also cool, although I wish you could see that character controlling the pen by some way like Yondu does with his arrow. But I'm starting to nitpick here. Great job! Really fun! 9/10