If you haven’t read nor watched the original Steins;Gate don’t read further. Steins;Gate 0 continues from the end of the original; you will be spoiled of the ending if you read further
Towards the end of Steins;Gate, in order to reach the Steins;Gate world line, Okabe Rintaro had to prevent Kurisu from being killed at the Radio Kaikan. In the original, he tried once, he failed, and then he succeeded in his 2nd try. In Steins;Gate 0, after trying once, Okabe gave up, and from there the story continues. Steins;Gate 0 explores the various world lines in the beta attractor field as compared to the original Steins;Gate and the alpha attractor field.
Much like the original VN, the main protagonist is Okabe Rintaro. Though unlike the original, the death of Makise Kurisu and his experiences in the alpha world lines has left him traumatized. No longer is he the self-proclaimed mad scientist, Hououin Kyouma. Okabe is now a diligent student studying in Tokyo Denki University who aims to go to Viktor Chondria University in the United States.
The majority of the remaining cast of Steins;Gate returns in the sequel, along with several new characters. Among the new characters are; Hiyajo Maho, a friend and colleague of Kurisu who developed Amadeus, a system that can store memories of a human in a computer; Alexis Leskinen, the professor who mentored Maho and Kurisu; and Mayuri’s three friends, Amane Yuki (mother of Suzuha, and wife of Daru), Kurushima Kaede, and Nakase Katsumi.The character designs are still done by huke (known for Black Rock Shooter). However, the colors are slightly different compared to the original. The music is also great; each track suits the emotions of the scene.
Steins;Gate 0 starts out more serious compared to the original Steins;Gate becomes even more serious the deeper you go into the story.because Okabe already knows the consequences of playing with time travel and because of his traumatic experiences. . However, there are also light hearted moments throughout the story that relieves the tension from certain events.
There are a total of 6 endings in Steins;Gate 0. The different choices made throughout the story eventually leads to one of the endings. However unlike traditional visual novels. the choices are made on the screen. Choices are made through interactions with Okabe’s phone (e.g. accepting or ignoring a call), and Amadeus. However because of this, especially for those who only watched the original instead of reading, they may unexpectedly reach a ending without knowing what choices led to it.
If there’s one thing that slightly disappointed me in Steins;Gate 0, it would be the true ending. The true ending is good, and it perfectly wraps up the story of Steins;Gate 0. However, I felt that there is something lacking, to the point that I was surprised that it the end credits is already rolling.
That being said, Steins;Gate 0 is still a worthy sequel to the original Steins;Gate. If you feel you want more after watching or reading the original,, Steins;Gate 0 will fill that want sufficiently.