It's very much trying to be a spiritual successor, but I'm not sure it really achieves the goal. The setting isn't as convincing (it's mostly Civ 5 in space, with orbital units). The factions all pretty much play the same, just with some bonuses. The biggest problem (though I suppose this has been a problem for all civ games to some extent) is that the AI is bad. It can do tactical decisions, but strategic big-picture it seems to have no clear goal.
It's worth checking out, but it's only partly the spiritual successor to SMAC it tries to be. I see a lot of people here recommending Stellaris, I haven't tried it but now I think I should.
Civ 5 wasn't bad, but I'd rather take on Auriga in Endless Legend if I'm playing a hexagonal 4X - plus it reminds me pleasantly of Master of Magic.