What a cool concept; I don't think I've ever playing anything quite like this before. It seems simple at first, but there really is quite a bit of complexity there. I think it would be cool to replay and see if I could use less satellites than I did on my first go (I placed a few right off the bat that immediately crashed into the planet, haha, so I'd hope that I'd do a little better), maybe mechanics to encourage that kind of replay-ability would be a nice addition. Either way, I may end up coming back to this one just because it was that fun.
I do think you can cheese it a little by placing satellites right on top of aliens. Might be something to look into if you have intentions of expanding on this.
But, in general, this is a super unique concept that's just executed really well all around. Also, something about the art and especially the music just really does it for me. Great work. So happy the World Defense Force boys and I got the chance to party in the end.