The reason for the 2 starts is the major lack of events or stuff do to in the game. I've been following and watching the game since it first came out. The artwork for the women is great, but overall the game is extremely boring. Most of the ship is still unavailable to actually visit. Some of the events are taking way too long for the artwork and backgrounds to be finished.
I know it probably takes a lot of time for the game to be made, but at the rate it's going it seems like it will be another 2 years before there's a decent amount of content. With no WT or some type of journal it's just a bunch of clicking the same locations time and time again for something to happen. The coding needs to be fixed with Lune. Why have her in 2 different locations when you click the hangar bay and the zero gravity room? There should be some type of clock to skip time or have the MC be able to actually go to bed.
Maybe in a year or two with a lot of content, locations to visit, and events the game might be worth a 4 star rating at least. Don't hold your breath though for a lot of "adult content".
UPDATE: With the having to click over and over the same areas multiple times this "sandbox" game is just boring. 2 sex scenes with Lune with how long the game has been out? Any only anal? With the lack of a lot of stuff I can't justify giving it more than a 1 star for overall gameplay. The artwork is pretty good overall, but won't bring up my rating.