Don't Look Outside

Everything was fine until a couple weeks ago. It started with the noise. People outside starting to scream, and then stranger sounds growls and shrieks no human could make. You were going to look outside when you heard your neighbor scream "DON'T LOOK OUTSIDE!" And then everything changed. The world is different now, people are no longer people. And the things they've turned into are... wrong. There's no other way to put it. But, you got lucky in a one big way. You live in a huge apartment building and can travel anywhere in it without going outside. Loosely based on the game "Look Outside" (Very loosely, because I've never played the game and did some very bare bones research). I probably didn't do it justice, and after looking it up, I want the real game. It's on my steam wishlist now.