End of The World is a demonstration of how Google Forms works as a vehicle for making and playing IF. It's a very unusual format, but it worked... surprisingly well. It's a traditional choice-based game with two options each time and multiple endings. Honestly, a Twine port of this would play pretty much the same.
The story starts with you being approached by a strange creature in a black cloak. You can hide, or approach it with violence. If you get the chance, you can learn its identity and ask it about what's going on. I admit that the "cat" scene didn't make much sense, but the story feels secondary to the game's purpose.
I'm not going to give this game a star rating, since it was mainly made to demo a new format. I can't really see Google Forms becoming a popular choice for IF creators, or players, but it could have been executed much worse.