I voted story... realistic body types would be next...
Some of my top games are...
Leap of Faith - for CeCe and her story, it cannot be overstated how unique and moving this part of the game is, it will punch you in the gut and then make you cry tears of joy eventually, you will always remember CeCe, she's one of the few, very few truly memorable VN characters
Acting Lessons - I love heartbreak followed by a (bittersweet) happy ending, it has a truly memorable story and characters, you won't forget this game, ever
Eternum - I love the Ready Player One SciFi setting and the characters, even if it's a harem game, but the characters have depth to them and the story is pretty great
Making Memories - pretty unique approach to the whole incest thing, it's more based on the psychology of things, not so much about instant horniness, and there are only two love interests, which I find refreshing, at times it feels like the arthouse version of your stereotypical incest game, still early in development, there are no sex scenes with either the sister or the daughter yet, but it's getting very close
Isabella - Dark Paths - only two love interests, pretty interesting story about a killed ex-girlfriend and the dark sides of the fashion / modeling industry
Price of Power - story focused pseudo medieval setting (it's actually the far future), only one love interest so far, the romance is meaningful and sweet, the closest you can get to a traditional romance without any of the silly antics usually found elsewhere
Now & Then - one of the few actually great harem games with a meaningful story about life and what makes life worth living after the Zombie apocalypse. Harem is mid sized, so that means each love interest receives all the attention needed, mostly avoids the usual tropes, some of the character arcs are really moving, also has meaningful solo routes if you hate harems. It is Honey Select though, but if that doesn't bother you... you will love it. Also, this game has probably the most elaborate and detailed ending of any game I have played, the ending is LONG, each and every character you romance gets her spotlight, you will be super happy with how things turn out
No More Money - as far as lighthearted and fun (and silly) incest games go I found NMM pretty enjoyable, even if you have zero action with either the mom or the sis yet, but the slowburn makes sense here and is well done, and there's also the aunt of course... the family is immensely likable and the mom, sis and aunt are of course super attractive, yet still look like actual human beings. And then there are a few side characters to distract you, if you need that
University of Problems - in my opinion the best college game. Better than BADIK for two reasons... there is no fraternity BS in this game (the MC hates this nonsense, as do I) and in the "teacher" department UoP wins hands down, Rachel is not only super attractive, while also looking like an actual human and not a caricature, but the scenes with her are amazing and her story is pretty good as well, but there's no one like Jill really in this game... however, I think characters like Carol etc are more attractive than Jill
Projekt Passion - still very early in development but one of the best comedic VNs I have played. It has lovable and fun characters, great humour, a great story, it's a step up from the already really good After The Inferno by the same dev. If you want a funny VN... it doesn't get better than Projekt Passion! Also, the character design is very unique, you won't find the usual faces here, but everyone is super cute of course
Matrix Hearts - yet another truly excellent comedic VN, this one has a college setting, but the college is not the focal point. You have super adorable and funny characters here, even the tsundere character is pretty hilarious, if you like comedy, look no further! Still pretty early in development, many paths have not yet progressed too far, so you will need a bit of patience here, just like with Projekt Passion
City of Broken Dreamers - probably the best Cyberpunk SciFi game. It has amazing cutscene and sex animations, a memorable cast of characters you can freely pick and choose from and a pretty great story
Haley's Story - yes the ending is rushed, yes Haley's backstory includes a nasty event, but it's probably the best brother & sister game that allows you to focus on just the sister, the banter is hilarious, the romance is super sweet and wholesome, the darker aspects of the story don't overshadow the wholesome sweetness. And while the ending is rushed it is still a happily ever after