Hmm this sounds a bit like like something I ran across during a random surfing session, a few weeks ago. I'm clueless about a name, but it had something similar where you had to abduct people and do all kinds of things aliens normally do when they visit earth.
It looked pretty cool though. Iirc there wasn't a whole lot of info, but the screens spoke about the army fighting you if you got spotted, and there was even a superhero in the extra missions, to fight you off.

In any case, yours seems to revolve around aliens vs aliens battling out on or near earth, so it may be a whole different game altogether. Looking forward to the screenshots, though