I wanted to play Mizuki island because the concept is exciting - getting trapped on a deserted island with a buxom babe and being able to either be the decent, human being and building something with her, or going down the nefarious route. Unfortunately, the execution itself of all the gameplay bits rendered me frustrated and unable to enjoy whatever there was to enjoy.
There are some annoying glitches in the game itself. You can't save on Windows 10 and have it be there the next time you boot up. Apparently, you cannot overwrite saves either during gameplay as I found to my horror and chagrin when I thought I was saving over data slot 1 but it hadn't saved diddly squat. The scroll bar also refuses to function and even when using the fixes prescribed in the thread, I was unable to get a proper feel of the game. It is also heavily censored to the extent that I might as well be staring at some vaguely skin-colored crustacean rather than any of the naughty bits like I'm supposed to. The aiming on hunting is infuriating. Arrows have awful trajectory and the game sometimes refuses to register a click. Fishing is rather dry and an annoying clickfest (also buggy because of the aforementioned scrolling issues).
But I'm prepared to forgive that if the game is teeming with content. Sadly, it isn't. There isn't a lot to do here and the scenes themselves are rather plain, even if supposedly interactive and animated. The heavy-handed censoring really ruins a lot of what could have been.
Thus, you have a game that doesn't have amazing gameplay, nor does it have amazing scenes. What it does have is a concept that almost takes it to the point of being passable, but just ends up falling short.