I was reading Gene Wolf's Book of the New Sun when I first came up with the idea for the game, so that informs it a bit, but Vance's Dying Earth, definitely. Warhammer 40K, I can see a touch of that, also maybe Dune. Although I've not read any of his works, it sounds a little like what I've heard of China Mieville's stuff too. Maybe a touch of Final Fantasy with "magic-tech" details. It's still in a very undeveloped stage yet, though, so as DrZombie says you can move it in a different direction.
It may be that your characters haven't interacted with anyone yet, but if you still aren't happy it's not a problem to change them.
WD - any particular objection to removing level limits for powers? I don't mind changing it to the RAW if you think it will be a tremendous problem as it was just a thought whilst I was coming to grips with the rules.