this one is the prototype version. it doesn't have multiplayer, and may be missing a lot of content as the creators probably dropped it after they made it onto steam as a paid game. plus the graphics compared to the steam one are pretty bad, just compare the ones from the steam game page to this game page and you'll see the difference. i'm broke though so i'm gonna get this one. i'll let you know if a lot of stuff is missing once i play it.