Overall I enjoyed it. It's slow, and measured. And it's nice to have something that's not relentlessly grim and depressing and miserable about the state of the world, even if it's not particularly cheerful given its focus on a crumbling relationship. I don't need to watch dystopian fiction much anymore, when the world is rapidly become dystopian! The whole parallel universe setting, where a barely post-Communist Czechoslovakia has become a spacefaring power, was interesting, as was the post Cold War vibe to the sets.
It wasn't a masterpiece. It was ultimately yet another Ageing White Dude Angsting in Space, with everyone else secondary to the tale. Carey Mulligan was excellent as always, but the two decade age gap is of course creepy, and though the action moved to her fairly often she wasn't presented as a narrative equal. And although a Czech story there were basically no actual Czech actors there or anything. But on the whole, it was a pleasant diversion with some interesting effects. Sort of surprising it got greenlit, but good on them for doing so.