Mother Lovers Society is one that stands out for me. It has a rather unique filtered art style, but once you get over it there's some fun stuff in there!
One of the best pizzas available in my locality is the "abomination" that is pepperoni + mushroom + ham + pineapple. Taking the two most common 2-toppers and combining them into something that shouldn't work, but absolutely does. I can't get enough of it!
That's kind of why I wasn't sure about where Valkyrie Drive sits on the old Ecchi___________Hentai slider scale lol. I mean it has a number of episodes with a fully hashed out story, multiple characters and worldbuilding, and doesn't revolve around just getting from one sex scene to the next...
I would certainly recommend it, I'm just not sure how lewd your definition of ecchi is. I mean, it's no Angel Blade, as I don't remember there being any penetration shown, but it has plenty of tig ol' bitties bouncing and squishing and flopping about. I enjoyed it quite a bit!
Adding another vote for Project Myriam. There are some pretty decent lesbian games out there with a female protag (obviously), but I generally stayed away from most straight female protag games until Myriam came along. I've found myself giving more of them a chance since, though none have...
Seconding the the Civilization games. Keep coming back to Civ VI, and realized the other day that I have been playing some manner of Civilization game for over 30 years now! Fuck I'm old.
Also, Light of My Life sucks me right back in every time a new update drops.
+1 for Light of my Life. It has a long enough update cycle that I can restart it every time it updates and enjoy it all over again lol.
Honorable mentions: Project Myriam, Something Unlimited, Back to Freedom