Isekai Paradise is an essentially kinetic adult visual novel with a generic Isekai LitRPG plot and lots of vanilla sex. Within these parameters, this game is close to perfect. Some people are giving it low ratings because they strongly object to the generic plot and or to the vanilla sex. In my opinion that's unfair. There is a large audience for this kind of thing. Not being part of that audience is no reason for a poor rating. Just like I am not going about giving one star ratings for games with gay sex, urination, scat or vore etc.
Isekai: We learn almost nothing about the male main character's life on Earth. The story starts when he is run over by
truck-kun, dies, and finds himself in a Middle Earth style world (roughly medieval culture with humans, elfs, orcs etc.). He soon realizes that he now has magical powers, an infinite inventory and other computer RPG abilities in what otherwise appears to be real life in a parallel world (which happens to feature typical RPG dungeons). Like in a typical LitRPG novel, we learn about characters' numerical stats, in fact they even discuss them, but we are not actually playing that RPG.
The plot being so generic, nobody should be surprised that the MC is
The Chosen One, destined to save this world from an invasion. To succeed, he needs to find out what's actually going on, while forming a strong party, collecting powerful artifacts and leveling up.
The nature of the first artifact that the MC picks up and of the party members that he accumulates thereafter make this the perfect setting for a porn visual novel. And this game makes perfect use of that. The girls are typical Honey Select beauties. (As so often, breasts are occasionally too big. But fortunately not so often or so extremely that it impacted my enjoyment.) Practically all females are young, beautiful, instantaneously in love with the MC, and open to sharing him. In other words, the MC is building a large, harmonious harem. I am tempted to call it 'cosy' but if you know what that refers to it might give the impression that there is spanking, which there is not.
Novelty of the plot is clearly not the main attraction here. The author has chosen a plot that is known to work because it has been done hundreds of times. A plot that is an ideal carrier for the porn scenes, and stays out of the way.
These porn scenes are what this game is about. The fact that it's all vanilla sex obviously imposes limits on scene diversity. But within these parameters the scenes are visually excellent. (Only the sex talk is a bit silly and lacks variety, at least initially.) The author uses a cheap trick to allow sex scenes with clothing inconsistent with the medieval theme. I am very happy about this decision, as the bunny costume scene is my personal favorite.
The game is very generous with these porn scenes while never getting to the point of overdoing their frequency. I think most can be avoided, but that's something I didn't really test.