What I liked:
*Music. I liked the minimalistic score and how silence was used. The silence fits well with the portrayal of the loneliness and isolation of the moon station.
*Cast.
*Visual effects and the set. I don't think this show had a huge budget but they did well with what they had. The effects are pretty good. The set looks pretty sturdy as well.

What I didn't like:
*Camera work. It was inconsistent. In the earlier episodes it was so shaky it was distracting and later in the show we got more creative techniques like the dolly zoom. I'm confused about why no one tried to fix it.
*Performances/script. The script was empty, it didn't build the character's backgrounds, we only get a vague idea of why every crew member is partaking in this mission. The dialogue felt unnatural. The performances suffered greatly due to how bad the script was. The writer didn't research at all that astronaut crews are trained to work under pressure but the crew in this show is all over the place.
*The story/worldbuilding. With the show's duration, we could have had a small world with its own logic and rules but we got an underdeveloped something. There were a lot of unanswered questions like what caused the water shortages, what did the people do to solve the problem, why was the original co-pilot switched at the last minute before departure, why did director Choi have that picture, why didn't the moon station fill up with water during the first incident, why did they introduce the spy storyline and gave no background on their mission, why did the sick people saw starfish?