I'm not sure you read my post, which says "you're right" on it
I'd be quite happy with this. More complex maps would take longer, and of course that'd add up, and if that means it slows down to 5 fewer updates of progress by this point in time, it's a pretty good tradeoff. That isn't bad at all. Good H-games are a very rare treat, and I like to see it.
The thing is though they don't have a support system, they're strictly working with what they got from Kickstarter. So the game devs they've hired aren't working for free, they're legit contracted to work with them. So right now the priority is finishing what's there. Anything else like refinements, system changes, additional scenes, the backer DLC, can be done afterwards.
They didn't ask for more money because they don't want to become like say Star Citizen, which took on more and more money, leading to tons of feature creep.
So for what they got, and what they've done with it, without any real slowdown besides the initial launch (which had a myriad of good reasons, like bringing on new staff and the lead dev going on paternity leave), they've stuck to consistent 3-4 month updates. Now they're on the verge of finishing, possibly even this year if we're lucky.