Hey! I am a Unity3D developer for going on 10 years now, and I have to say this whole genre is awesome to me. The enemy difficult is great, and ambiance and environment sounds are spectacular. I would add some effects to the vocal, a building like that would be very echo. I also have some ideas about the gun hand mechanic and how to make it smoother(it feel clunky right now), which quite the mechanic! Let me know if you would like help on the project, I have quite a bit of free time right now and would love to see what other situations we could make from this!
Oh also I am Alexander Nava! I got to excited and forgot to say it lol.