TBH I feel you kind of have to lower your standards when it comes to porn games. Most, if not all, of the ones backed by substantial production teams tend to mostly be cookie cutter slice of life VNs consisting of still cg h-scenes that kind of just blend into one another and maybe the latest copypaste job made by Illusion/Illgames.
The rest are, TBH, allot of the slop being posted in these forums; games like Cloud Meadow that feel more incomplete than this game does and is probably never going to have a "full" launch like this did because the patreon money they get from just doing hotfix patches every month is basically giving them all the money they need from doing almost nothing. The glorified Visual Novels made in RPG Maker despite the fact nothing is really done that really justifies the choice of engine. The games that use those horrifically uncanny stock XLNara models or outright stolen porn gifs/pngs for their slop VNs. That's not even mentioning the ones that are almost unplayable.
Only a few half decent porn games manage to get finished every year and half the time you have to be able to tolerate the more niche kinks the dev(s) may focus on that you find cringe.
To be honest, the story could have concluded with the boss of the third stage and the game would still feel like it has the content quantity of an average h-game. If the game didn't hype the players up for a bonus level after beating the game in hard difficulty only for it to be a terribly coded superboss with no real h-scenes to unlock from fighting them and changed the narrative so that things felt a bit more conclusive at the end, with maybe a little tease at a potential sequel if they really wanted to, I feel allot of the complaints would have dissipated.
There was also the issue that the dev basically released what would end up being 95% of the whole game as a crowd funding bonus. I think that if the dev kept maybe at least the third level under wraps, people here would have felt less disappointed.
Overall, I just find it a miracle that this game is even moderately playable and has a good amount of quality, animated h-scenes.