I like the premise of the game!
It was very difficult for me to figure out who the hitman was, though. I noticed that NPCs sometimes do an animation where they seem to be making something with their hands, which looked a bit suspicious to me, but it seemed like nearly every NPC did this, so I couldn't really single any NPC out.
Also, I noticed that, when booting up the game, you will immediately shoot when clicking on the application (to get your cursor locked in), which is a bit inconvenient.
I do like the setting you've created with the art and with the sniper scope! It does feel like you're actually at some important event.