For an NTR game this is pretty much as good as it gets outside of 8-bit titles, I've seen the plethora of other titles and they all look like they were made by first time hobbiest manga artist. KL keeps getting better with each title if you look at what they've published before. Some day they'll get to a higher quality.
While I stand with you on almost everything you've said there are a couple of titles whose artwork I believe is well made, Young Wife Souffle is one that immediately comes to mind as well as another one, which the name escapes me right now, featuring an Elf that has to work different jobs to pay off a debt (this is done by changing clothing be it for a Receptionist, farm helper, nun, school girl, dancer etc.)
One of the reasons I really like KL's games is because of the mechanics. I find them unique and this is a well received refreshment in a world primarily dominated by RPG maker kind of games. I do not know how large of a team (if any) is working with/at KL. But I feel that it may be a daunting task to storybook, script, code and flesh the mechanics and then dedicate time and resources to art for a solo artist. This is somewhat shown by CG progression in the variant sets (in all of his games). However, I can see the growth in his games and I am excited since it has always been progressively improving with every new title. For instance, The game with the two Warrior Girls, NTR House/Castle or something, introduced the Magic Mirror to spy on the girls and their thoughts. Later in Sexy bar, the magic mirror had some movememt animations as well as a shadow animation in the game (if you lose the noble's game). And now, we have even more animations in Time Loop NTR.
