You have to check paperwork and look for fakes and smugglers and terrorists. You have to support your family, so if you move too slowly or get it wrong and have your pay docked, they have to starve and freeze.
But is following your job description always the right thing? Do you let in vile traffickers and deny entry to refugees? The human cost of your decisions is shown subtly but clearly.
The gameplay controls are awkward: you need to drag around paperwork on the too-small desk, align stamps on visas, manually compare information. But the awkwardness works: you are an untrained cog in the machine madly shuffling paper, under pressure, and trying to do your job.
The unusual nature of the gameplay also means that there's a level playing field. This is a game non-gamers can and should play. So often, you hear about some amazing new indie game with some really amazing story, only to have that story locked away behind some twitch gaming or platforming that might seem easy to frequent players of the genre, but stand as a brick wall for others. (For example, I'm sure that Braid has a lovely story, but I got stuck a few levels in because I just cannot do timed jumps. That's what happens when you grow up without a game console.)
I absolutely, wholeheartedly recommend you play the alpha version of the game. Yes, the gameplay is unpolished and sometimes awkward. But it manages to do one thing better than any other game I've played: it makes you feel, and then it makes you think.