First off, I want to point out that this game isn't very optimized and it'll likely crash a lot if you play on a potato like me. This isn't going to affect my rating of the game since I don't know if it crashes as much as it does on a decent PC.
So like most of the other reviews point out, the game is grindy and there's basically no point to the JSK-style combat system. The grind itself isn't so much the issue as the fact that none of what you get feels very rewarding.
One of the things I noticed is that this game has a lot of typos and misspelled words. But even if you overlook that, the dialogue is a bit bland and sparse. There's like a scene when you hit affection lv 20 and 40, one where you initiate a 3-some with a pair of girls for the first time, and some comments referring to recent sexual activity (which is a plus imo), but the characters aren't developed, there isn't really a story to follow, and there's basically nothing to do but grab points and raise affection until you can fuck.
There's a few other mechanics sprinkled around that feel pointless, like biking for raising maximum stamina, which is negated by the fact that you regenerate a fixed, small amount of stamina every day and it's only ever spent to convert lust to currency when you nut, and that also regenerates super slowly. You'll basically never stockpile enough stamina to justify raising its max.
The aforementioned JSK-battle mechanic is a pain in the ass. First of all, you have to buy upgrade points one at a time. It'll take you 2 clicks a point, so if you want 100 points to spread out, you'll need 200 clicks. Secondly, the opening meter is completely pointless to you if you can't have sex with the girl. You do less damage to them attacking them while they're stunned than punching their face. The only other thing you spend your Focus (which is like MP) on is tearing clothes, which you'll fail if the girl's HP is too high or she's not into you enough. There's no super moves, attack interrupting skills, HP regen skills etc. If you can't or don't want to lewd, Focus is completely useless to you.
The whole girls catching you having sex mechanic is also completely useless. Not only is it nonsensical, because you're all consenting and presumably noncomitted adults, but with how much grind you'll need for currency and the low regen of stamina/lust, you're not going to be having sex often enough for that to be an issue. Or at least not until you basically cleared everything, at which point you can just save scum to reroll everyone's positions until the literally unfuckable character is spawned far enough from the girl you want to fuck. There's no time table for the girls, their positions are always random for better or worse.
In short, the game is lacking in all areas and doesn't at all feel like a complete product. It tries to mimic parts of the games that we might be familiar with, but waters it down to "what's the point?" I feel like the game would be more enjoyable if there were more upgrades or QoL improvements. As it is now, it feels like a bare bones time waster that doesn't understand that the grind is supposed to become easier over time in these kind of games.