Good game I can say that I noticed some good and bad things while playing it:
The good parts:
1. The UI looks incredible
2. The game runs well in the browser
3. The audio feedback is well done (you can hear it when you shoot the rifle + the background music is quiet and calm)
The bad parts:
1. Maybe a small tutorial in the game (optional considering that in the description of the game says what you have to do).