The Steam Next Fest Demo only includes early versions of Local Mode and Streamer Mode.
The Impostor is a unique social deception game, where you play either as an impostor, pretending to be an AI, or as the detective, who is trying to expose the impostor.
The detective picks a question for the impostor to answer. The impostor must write an answer which will sound like it is AI-written. The impostor loses the round if he is exposed.
There are several game modes, each of which puts a new spin on this system.
Campaign Mode - Hone your human-detection skills.
Online Mode - Play with other friends who own the game.
Local Mode - Play locally on one computer, taking turns.
Streamer Mode - Play with your stream chat.
The game is currently in the process of being tested and built in public, and should be ready around March.