Nice game, I like the graphics alot and the audio is nice too, but since you are using unity, I really recommend a WebGL build of the game. It makes a lot more people want to play it and its really easy to build for WebGL
Yes, I would prefer a webgl build too, my decision was because in a 3d webgl build the graphics fidelity is affected and the perfomance is not optimal. In this case the game needed some decent use of cpu for the rewind of particles, bullets and sounds.