Nibiru: Prologue is a demo version of Nibiru. That is a cooperative survival game with an exciting 4-player storyline. Right at the moment Nibiru is in development process and will be released in 2020.
Nibiru: Prologue was created to familiarize with the general concept of the game and designed for several hours of gameplay. This current demo version ain't got saving mode and joint game.
The fall of the spacecraft is only the beginning. Seven astronauts survived the crash. The purpose of the expedition exploration of the planet, data collection and survival.
Let this world see what you are capable of. However, remember: you are always surrounded by the monsters of a pure evil, which is far more dangerous than a beast or any weapon that you have. Show your abilities in a world that covered by monsters, deadly phenomena and incredible beauty, which is goes by attraction for new inhabitants.
All this and even more awaits you in Nibiru, which will receive constant improvements and additions.