Just played part 1 (out of 5 - but 4 and 5 haven't been released yet).
It's a zombie game, but so so good.
End of the world scenario... people getting infected, survivors banding together. But the game isn't so much about fighting the zombies (although you do that too!) as interacting with the other survivors.
Lots of conversations, and every choice you make matters. The game and the other survivors constantly change how they react to you based on your choices.
And here's the kicker... You usually only get about 10 seconds to make a choice, so you have to make gut-feel responses... That's the part that really makes this game interesting. And the game makes you make some hard choices.
Small spoiler alert:
At one point two of the people in the group are being attacked, and you have like 3 seconds to decide who to help. That was awesome, because it was really stressful, and it really felt like an emergency snap decision... And everyone reacts (pretty strongly) to your choice afterwards.