I'm a fan of Warlock and Boobs, The Agnietta (before the patreon incident), Town of Passion, Aurelia, Divine Arms, Alchimia (still too few content but very promising) Future Fragments, Knights of the Lust Temple (the first version, the second one is crap) Divine Arms, Daily lives of my countryside, Daily Chores, among many others.
most games on steam are either shovelware (mediocre), or outright bad, with no passion or inspiration involved. I think hentai games must be some sort of passion project in order to be truly enjoyable. Plus no fun if no odd kinks.