Hi CoalFire,
nice to see that you are interested in this years beta game (by a different team of students than last years elemates).
The game has german and english subtitles (currently disabled because of a game breaking bug but this will be fixed in the near future) and a german voice over.
We set out to make a cooperative game. So yes, two players are mandatory.
You can play either via directly connecting using an IP or by using the server browser.