Flatspace is more like EV Nova than either of those. http://itunes.apple.com/us/app/flatspace/id334244117?mt=8
Space Miner has the EV interface and visual look, but Warpgate has the EV gameplay (multiple factions, trading, storyline through missions and overall tone). Personally, I prefer the EV/Space Miner interface. Give Warpgate an interface like Space Miner and I'd be much happier than their strange 3-d interface and horrible space combat.