Solvalley School is a slice of life comedy, if life worked on porn logic. It's a highly self-aware product, and this works in its favor.
The pitch is you're a young man with an enormous dick, in a town populated by women who are huge sluts that love big cocks. You fuck them, and eventually you can choose to settle down with one, or choose to share them with your buddy occasionally. There's some minor world building with some green-skinned people that are discriminated against, but honestly it doesn't matter.
The strongest thing going here is the game's casual, self-aware writing style. The main character has a blasé, uncaring attitude towards the feelings of the women around him, and the humor emerges in how much they let him walk all over them. If this was a serious story you'd feel bad, but in this game it honestly works.
There are, no exaggeration, conversations that go like this:
Love Interest #113: MC, I love you so much, be my boyfriend.
MC: Nah, if I do that, I won't be able to fuck all the other sluts around.
L.I. #113: Is that what you think of me, that I'm a slut?!
MC: Aren't you?
LI #113: I guess so. Let's fuck.
Then they fuck. The cavalier writing is honestly kinda fun. If you're into an unabashed "Story" about a big dicked guy having consequence free sex with a lot of dumb bimbos, this is the game for you.
On the downside, it's Honey Select, and that means problems. Because it's so easy to create characters in HS, authors tend to go hog wild and make literally dozens of them. The issue is that the program's individuality is very minute- slightly different eye shapes, hair styles, and eye/skin colors, as well as physiques. So after about the fifth Honey Select generated character, they begin to run together. It happens in every game of this type. So, despite there being a shit ton of content here, it feels sorta like how Ubisoft open world games feel. A lot of copy-pasted variants. Since the story is so simplistic (meet girl, fuck girl x30), you begin to skip past the dialouge. Eventually you just hit the same pre-canned animations over and over too. These games could all stand to be about 70% shorter than they are.
As far as the actual gameplay goes, it's a straightforward sandbox Ren'Py game. Fortunately, it doesn't hinder your ability to see the content much. There's not much grind. You won't be repeating many scenes unless you choose to.
My final verdict: if you have to play a Honey Select game, this is one of the better ones.