Get this out of the way:
Renders: 5/5
excellent variety, beautiful design
To sum up why the 'game' is a 2/5,
MC is a fit, huge-cocked guy on a harem island with a dozen women who can be 100/100 affectionate/loving/lustful for him, and because of the 'game' design he still has significantly less sex than the average, single person in their early 20s and maybe 1/20th the sex of the average person in their early 20s in a relationship.
Falling back from that, the typical "grinding =/= gameplay" critique is on this game like white on rice. Lots of games have grind, some even manage to make it fun. Calling this game's grind "tedious" is an insult to grinding boulders in Elden Ring. The difference is after an hour of boulders you'll be noticeably stronger but after an hour of grinding Holiday Island you get a boob and another hour of grinding.
Looping back to my initial critique of the lack of sex. This game, and it's weird to say this about a tropical harem game, has ridiculously un-immersive levels of frigidity.
e.g.
Jenny quite literally could not feel more affection for you.
Jenny quite literally could not love you more.
Jenny quite literally could not lust after you more.
Now meet Jenny at these coordinates at this time so you can take a selfie with her.
Oh, did you not spend 5% of your time playing this game jumping through the grind? Well, Jenny doesn't love you enough to take a selfie with you anymore.
Sex??? You want SEX in your porn game?! What kind of anim- you know what, here's 10-20 minutes Texas Hold'em with maybe a 2-frame-animation vanilla titfuck at the end. And I mean "maybe" because if you slacked off your grind you get a goodnight kiss and hospital-tier blueballs.
Holiday Island is an excellent porn game if you prefer your porn games without all the porn or games.