This one for me is among the top 5 best vn of this site and I'm giving 5 stars for that reason, but this game has an error in my point of view and this will be shown in my analysis below:
(names in green mean a positive point and names in red a negative point).
1- plot : the story of this game will keep you focused and clearly has been written with care. It's common to see in h - games that the story is bad or simply doesn't exist and having only one justification for everything that is happening and with that focusing only on the characters' relationship. In Oppai Odyssey, both the story and the characters are well done, so the progression of events certainly keeps the viewer focused on the plot.
2- Characters : Each character in this game has a unique personality and look, so when playing Oppai Odyssey, you won't feel like the girls for example are clones and have slight differences in personality. Not just the main characters, but the secondary ones are also well done.
3 - MC : the mc of this game can be analyzed in two ways, for history he is a born leader, he clearly thinks of others and not just his crew but the people around him and will do his best to lead them out of a difficult situation to go for something better. Regarding the h - event, in this game the mc can be romantic, Alpha ( Dom ), sub and game helps to define it not only through moral choices but through the kinks that each player has, because in Oppai Odyssey it is a game that it presents several kinks and it's up to the player to choose or not and with that to shape the mc's sexual personality.
4 - technical issues (game sound, ambience and performance) : I have nothing to complain about, the scenarios are very well done and the sound effects / soundtrack were well chosen in addition to an excellent performance.
5 - sandbox : this was the subject that IN MY OPINION was something that was not well implemented in the game, I will explain why I think this according to my point of view and then I will say how it is currently present in the game (remembering that this analysis is from version 0.3.9x ):
- when I think of a h - sandbox game I think that in addition to the story of the game itself, the protagonist must develop relationships with the npc and through these actions new interactions with that npc can be unlocked and, moreover, have a world that has things to make it as if it were a routine, I will give an example to explain: the mc after some events in the game is interested in his childhood friend and invites her on a date, she accepts and then the sex happens, so far normal but after that because it's a sandbox game you can interact with your girl to have sex? the answer is no. In this game, yes, there are some scenes that can be repeated, but the fact that there is no way to interact with any girl at any moment you want, make the sandbox tag not making any sence, any action like give her a hug, or to take her somewhere through the simulation room (the spaceship has a room that creates simulation according to the character's will, so you can create a sauna, a bar, a swimming pool, a study room, etc. ), call her to sleep in your room, kiss her or even have sex in different situations because the npcs in this game has a routine that morning, afternoon or night may or may not be in the same room as the day before, nothing this actions i writed has in this game to be repeteable like any sandbox should have. There are no repetitive actions to give some reward like, studying to gain intelligence, working out to gain strength, taking a girl on a date to increase her affinity. So in my point of view the '' sandbox '' of this game goes very linear the way it is and for people like me who like sandbox, the tag '' sandbox '' can even be considered a click bait for some.
to finish this subject, the sandbox of this game works this way -> every day you will have events that are shown on the map with the green symbol around the avatar of the characters, these events are unique and do not have the slightest difference if you watch an event of a girl before the other, because the event will be the same when it is available again (sometimes the day after that event that you stopped seeing, it doesn't appear but don't worry because it will appear again on another day). when the characters' avatar is without any color or exclamation mark (gray outline) are the scenes that can be repeated (not all have something lewd). Other events that have '' ? '' or '' ! '' are part of main story progression.
conclusion :
Oppai Odyssey, is one of the best games on this site and will make the player hooked with the game because it has an interesting story, wonderful characters, pop culture references from games and movies but it lacks in its gameplay, being a game that in the current version ( 0.3.9x ) lacks basic stuff that characterizes a sandbox game.