A fun mechanic, and a beautiful presentation, nice job!
I had fun playing, and the tutorial was very helpful, you did a good job teaching the game. Consider making the tutorial a little bit faster for players who get a hold of the rules quickly. This might be tough to do, but I noticed I was on the WASD section of the tutorial for a bit too long even though I was moving around, and once I started shooting with the weapon it would have been nice if the text transition immediately started.
In any case, that is just a small critique, and the tutorial is already good enough as it is. Great job, I liked playing this game a lot!