If anyone is interested in playing a "Vortex Wars-like" game on their iPhone, I play Strategery.
In the AI mode it is very much like Vortex Wars. It has up to 5 players at a time.
In the Online battles mode it is mostly like Vortex Wars, but here are the major differences:
-Online is only 1v1
-Other players can take forever to take their next turn. Sometimes it is a minute between turns, but it can take a day or more for some of them.
So, if you want to play me 1v1 and take your next turn whenever you feel like it, consider Strategery. Over there I am also BeatlesFan.