Some thoughts from someone who hasn't read through 200 pages worth of comments and therefor might be repeating things:
It's been said, but yes, text-skipping would be nice. Until then I recommend X-mousebutton control for a rapid left click macro.
Grind: Honestly It's not the /grind/ that's bad. It's the lack of things in-between. Adding in a bunch of super small events would help a lot, as well as more varied interactions other than the current repetitive: Flirt, study, train, sleep.
A bit better 'tutorial' would be nice, or rather, the information already contained in the database should come up the first time you interact with the thing.
Personally, I'm also not a particular fan of the way progression works right now.
First, being forced, basically, into the 'harem' route. Not that I mind Harem in general. But in order to progress you're forced to basically date every girl, even ones you don't care about.
Then, i'm not entirely a fan of being forced to progress the story in order to further the relationship. I understand why it's a thing, and it's not necesarrily a deal-breaker, but it makes it difficult to really play the game at your own pace.
Honestly. it makes it so I wouldn't /really/ call it a 'sandbox'.
Everything else is super minor oddities. I like the phone, but it's a bit clunky. I think it would be nice to also show character icons on the map itself instead of just a list to the right.
I personally think it would be nice to have money on the HUD. The first time I went on a date I realized I had no idea how much money I actually had before starting it.
The wardrobe shame mechanics are a bit weird. I understand it, but you also have cases where you're experimenting and then she throws a fit because she won't show her tits.
Also the shame for wearing a swimsuit is like 700, when the limit for it is way lower. So it's kinda weird she'll wear it naturally?
Also finally, personally, I'd love to see a slight art difference when a wardrobe set doesn't include underwear (Nipples protruding a bit ect)
Anyways, the game is honestly amazing. I'm definitely hoping to see more.