Twine is a relatively new game development tool that makes it easy to create a simple game. I hesitate to describe it any further because many different people have managed to make it do many different things. However, when someone says Twine game, the image conjured in their mind is that of a choose-your-own-adventure-style interactive fiction experience.
Everything about Twine is contentious or rather it’s causing people to at least check their assumptions on what they knew about games or their genres. There are some in the interactive fiction community wondering if games in this style qualify as such next to games developed with parser based interfaces. You have those of the formalist persuasion saying that they are not games at all and the less thoughtful members of the gamer population saying they are utter wastes of time.