From the introduction:
ViewScream is a game designed for play via video-chat (for example, Google+ Hangout).
You can call this a role-playing game, or a story game, or a larp.
Varp also works (it's an acronym for video-augmented role-playing). Interestingly enough, varp is the Icelandic word for 'projection.'
In this game, four players portray members of a starship crew. They are in great peril. There is no game master (GM) and there are no dice.
The entire game is played in-character from start to finish.