If this were implemented as a RenPy sandbox VN, it'd probably be sitting at around 3 stars, maybe 4. However, it being fully animated and allowing for free-roaming does boost things substantially, but make no mistake - the game is still essentially a sandbox VN in almost all of its mechanics, and this includes some predictable weaknesses:
- Girls follow standard WEG archetypes: You have your MILF, the bratty sister, and the horny aunt. There are a few other girls but they are sorta disconnected from everything else in a way that represents feature bloat.
- The plot is almost non-existent, and to the extent it does exist it is rather silly. But that's okay, I'd rather have a silly plot that I can ignore than a stupid one that wastes a lot of time.
- There is a bit of feature bloat but the core experience of the game is there and can be pursued without engaging the bloat. I mostly have in mind the money-collection minigame, which I didn't even realize was fully implemented until the postgame since it is just not relevant. There are also some random activities like setting up spycams that technically exist I guess but do not seem to have any payoff. I guess if the intention was to *not* have this come off as bloat it should've been integrated into the main game more clearly, where there are progression gates around buying items or using spycams. The same could be said of any of the activities on the "other ship" - it's technically there but if you're trying to follow the mainline progression you probably will not engage with it much.
- The game relies heavily on the sandbox VN formula of having each girl have a schedule, where you can interact with them doing certain activities in scripted ways that have a few choices (and more choices are unlocked as intimacy deepens.) I did like the mechanic that let you influence their schedules and set up the events that you want to see. Progression is simple enough to achieve, and doesn't require much grinding, but there are moments when it's unclear what specific choices you need to make to see each scene. A nice QOL feature would be is if it showed clearly what the scene is that you can achieve even before you've done it.
- The game basically has a placeholder ending. I'm not saying it needs one exactly, since long ending scenes are often annoying, and the real "ending" is being able to unlock some postgame scenes, but maybe those should be more rewarding and/or give closure to the game?
Those are some particular points but the headline point stands: Mechanically/gameplay wise, this is basically a sandbox VN. Not a great one, but a competent one that doesn't waste your time. But the fully 3d implementation is so welcome that it deserves 5 stars.