This is such a cool game xD
A few things in my opinion: a settings menu for settings and volume sliders would be nice, more music would make it less repetitive and more interesting, more choices of weapons would be cool, more levels or missions maybe, and also it would be much nicer with more detailed models and scenery stuff. Also i feel like the camera could be slightly smoothed out and you could also add keys to increase and decrease the height of the camera.
Despite all this stuff though, I have to say, the game itself is actually really quite fun, and causing extra chaos to lead the humans to safety is a pretty cool idea. Although not gonna lie just like the other comment, I got too carried away and just bombed the city. I'm pretty sure in real life if a nuke landed right next to me I would (obviously) be dead and also freaked the hell out, but this is a game so it's fun I guess. Apart from that, the models and stuff are pretty good (although again there could be a bit more detail). I actually don't know how you got the game running so smooth with all the destructable objects though.
Anyways, great and fun game where you can nuke people! Or save them...but a nuke solves all problems!