Nice list!
I have a few games to add, some well known, others less so:
Syvaron's Portals of Phereon. Probably the best hex-based tactics game I've played.
Mado's EroDungeons. Darkest dungeons, but lewd. The mechanics are familiar, but it's different enough to be interesting. The dev makes great little strategy & tactics games. I'd also highly recommend EroHunters and EroWitches.
XXXivilization. Strategic conquest with sandbox and RPG elements later in the game. Chapter 1 has better gameplay IMO than Chapter 2. Also features a rather... memorable sex-combat system. Worth checking out.
Fenoxo's Corruption of the Champions (The OG) & Trials in Tainted Space. Solid text-based open-world RPGs with fun combat systems. Trials In Tained Space arguably has enough subsystems to qualify as an immersive sim. As for the ero content, it's mainly monster girls and futa.
Strive4Power's Strive series. Combination slave management sims and RPGs with fun combat systems and slave training.
Free Cities. While not especially complex, arcology management, slave trading, and future societies manipulation makes for an enaging little economic sim.
Westane's The Company. Probably the best lab management game other than Lab Rats 2. Lots of corruption content and many branching paths for characters.
Wape's Incubus City. A dark sandbox game focused on the player impregnating unsuspecting women. The gameplay seems simple at first, but has more depth than one might think, mainly centered on managing karma and extending your run through secret methods.
Kittery's Paraphore. Surprisingly complex and engaging metafiction, if ya can stomach the twisted content. Not for the faint of heart. It's great!
Indivi's Lust Doll+. A solid free-roaming sandbox adventure RPG. Broadly similar to Lilith's Throne, but with more of a story.
RahiMew's Broken Dreams Correctional Center (BDCC). An open-world sandbox game set in a space prison. Also similar to Lilith's Throne, but with more content and a nice streak of brutality.
Perveloper's Captivity. It's a pretty solid little 2D shooter, in the style of old flash games.
Vrlenir's Degrees of Lewdity. The best orphan sim on the market. Be a Dickens character! Get fucked up by everyone you see! Also contains surprisingly fun market mechanics and tons of depth to the world.
Godspeak's The Silkfang Respite. Kinda like pokemon, but you can spank the monsters you catch.
Anduo Games' Third Crisis: Neon Nights. I've only played the public demo, but it is shaping up to be a high-quality immersive sim. Cyberpunk flavored.