Well everyone's still replying and this thread helped me, so why not.
1. The Last Sovereign. A decade long passion project, TLS is simply incomparable. It's a vessel for the author's cleverness, silliness, sexiness, and seriousness all in one. A rare achievement.
2. Parasite in City. Insanely hot art and animations.
3. X-Change Life. Hot, lots of content, mods, generally really well done AI. And with a lot more on the roadmap that seems super doable.
4. Ravager. Great kinks and writing.
5. Incubus City + Patriarch. Similar real porn games with great choices for the art.
6. Third Crisis. Depraved corruption kink stuff which I love.
7. Ambrosia. There are many games with the theme of "innocent magical girl goes to tentacle labyrinth and gets corrupted." This is the best.
8. Lilitales. Corruption with like a surprisingly serious story and lore? I was surprised.
9. Capitivity. Genuinely fun game with sorta crude but surprisingly effective animations.
10. Claire's Quest. Loads upon loads of scenes in this one. Only about half of them are to my taste, and that's just fine. The game is pretty good, to boot.
Honorable Mentions:
Other Kagura games eg Crimson Collosseum, Raven's Quest (great outfits), Sol-Rui After, Elf Princess Trainer 1/2 and Four Elements Trainer