Nice work on the AI. The target and your assassin both feel fairly realistic in the way they react to you!
I gave it an honest play through the first time. But when I played a second time, I discovered I could cheese it by just sprinting 100% of the time XD. It seems I can run faster than both the target and the assassin, so I was able to clear the game really quickly. I think a stamina bar would be helpful.
Also there were times where my target was walking next to someone in the same disguise. It would be great if I could accidentally kill the wrong one and be punished for it, instead of the "auto-aim" ensuring my success.
That said, this is still a really well-executed game in such a short time and I had fun playing. Good work!