Yeah, that's the tricky thing with .gif files that I've found: file sizes explode for big images with lots of frames. Frankly, I was very impressed that you could do a GIF of this scale at all. My biggest GIF to date was this shiny sword. More frames, but much smaller, with a single animation effect. Given the complexity of what you have already, I hope my suggestion doesn't mess with your file size. Then again, considering that the doomsday clock is currently at 3 minutes to midnight in real life, you could probably squeeze in what you need in 6 frames.

I would also suggest that you vary the duration of some of the frames, lengthening the beginning and the end frames, whilst quickening the "missile flight" ones. That would give me as a viewer a bit more time to appreciate the prettiness of the rest of the map without the rather-distracting missiles flying. This would, however, mess with the "pulsing logo" thing you have going on, so I guess it comes down to a balancing act.