Really impressive that you managed to build a full 3D game in just 3 days. I really enjoyed the atmosphere - it has a nice dark ambient feel. And it was funny to recognize the Italy map from CS :).
On the downside, I ran into quite a few bugs: a group of enemies piled up and pushed me under the map: 
after picking up the blue mask I died instantly after about two seconds with no way to avoid it. If you attack too many times in a row, the knife sometimes stops working completely.
I also think you might have taken some inspiration from Assassin’s Creed :D 
And a few masks spawned inside walls from time to time.
Overall, it’s a cool game — good luck continuing your 3D journey in future jams!