Very good aesthetics and a flair for visual design is undercut by strangely adversarial game design; this title seems as though it is made by developers who are resentful of the player. Exits are hidden off-screen with no indication, events are required with no hint system, the game is needlessly gated with limited saves, instructions for minigames are not repeatable and never give hints even if the player clearly didn't read them properly, you can't skip content you've already seen despite the game being explicitly designed for multiple playthroughs, the girls have affection levels for which there are no indications, everything seems designed to set the player up for failure.
The minigames during sex scenes are the worst idea; high-quality sex scenes play out while you stare at a meter off to the side, then you're rewarded by being told that you failed anyway. The foreplay minigame tries to involve the player in the actual scene, but even that becomes quickly tedious and outstays its welcome. Yes, by all means put some "game" into your "porn game." But don't lose sight of the fact that we're here for both. The minigames aren't nearly fun or engaging enough to carry the day. The graphics are, but we're asked to ignore them at what should be their crowning moment.
I lost interest near the end of the game, and would recommend you skip this one. Hopefully they make another game though, because the visuals are top notch and I'd love to see these guys work with someone who wants the average player to enjoy themselves. This one has the underpinnings of a great game, but in the end it's just an exercise in frustration.