Whew, to the questions:
1. This really isn't like AI War at all. It is realtime, but it is not an RTS.
2. I think the games that are broadly similar to this will become clear when you see it, but EV nor AI War nor SPAZ are among them. I'd rather not start comparing the game to other games just yet, though, as that starts to set expectations certain ways, etc, etc.
3. It is indeed a solar system, right now with 8 planets and a few dozen space installations. The overall play area is not incredibly large in the sense of how you scroll around, but this is important because you have to react to things around the map, and your interactions with each planet are a lot more than cursory. Too many planets would be... incredibly overwhelming to manage.
4. Awesome on space game junky!