Some impressions / constructive criticisms:
Too many characters and not enough variety / role for them. Examples include the following.
Too many white / silver haired characters, too many near-identical demons, converted enemies that just sit around and do nothing except split the same character role between them and reduce the screen time and relevance of each.
What story purpose does Cassie perform that Morgan doesn't do better? One Vegeta-type character is good, five near identical versions just dilutes them. And you compound this by bringing in the other Morganna so now there's two of them when there's already not enough focus to go around and too much overlap? And that's not even getting into how hard it can be to keep track of them.
First thing I'd do is send the original human Morgana to Karen (and age her up some so she's visually distinct and there's not this creepy impression that MC's mom was banging a chick barely older than her own son). Let them resume their relationship, leave her human and place her in the role of a mostly background supporting character. Have MC view her as a second mom, and everyone be happy that Karen has a companion and lover of her own and that their tragic story has a happy outcome.
Since Cassie overlaps with demon Morgan (on that note, if you're going to have both Morgans can one of them get a name change please?!), I'd alter Cassie's model to be visually distinct, make her a lesser demoness and make her the girlfriend / subordinate to demon Morgan. Reduce her role to minor supporting / background character and give any and all plot that would have gone to her to demon Morgan.
Samantha the succubus is different enough to potentially be a fun standalone harem member, but you've already decided on writing her out so never mind on that front.
Camilla the sister has a stunning design and hits the "big titty goth GF" fantasy bullseye but being the sister she's off-limits and that's a waste. Her former subordinate (I'm starting to forget names here) should have gotten that more appealing character design and role as "dark writer turned good". Turning her into "speedster kitty" undermined her entire appeal and still left the goth yummy role filled by a character we can't have. How to fix this without a rewrite, I don't know but it's a big missed opportunity.
If I was doing a rewrite, by the way, I'd make Camilla's dream form a tall, Morticia Adams sort of figure draped in black and shadows, with glowing eyes all you see of her face aside from the occasional glimpse of wicked fangs, and her human form the plainer goth that you used for the other dark writer --basically, what she wants to look like and what she really looks like. And given her trauma, that dream form is dark, mysterious, ethereal, and untouchable. It's a form intended to intimidate but also to keep everyone at a distance and thus protect herself emotionally. Have her revealing her human form a sign that she's healed enough to let down her defenses, and state that she's going to build a new dream form in her new world which won't be so defensive and would allow people close to her again.
Dark writer's sister the green invisi-kitty has the sole personality trait of being a nympho, which would have been better for the role of a succubus aka Samantha but she's written out and well, we now have a redundant character who's just another sexy kitty who wants the MC's cock just like everyone else.
Then there are the OTHER characters who got pulled in like the pink-haired tsundere, big titty lawyer, big titty college student, the nurse, alien chick, etc who just manage to make the already sprawling cast even more unwieldy.
The fact that I got this far without even touching the four primary neko cast members proves that the scope of this cast is way out of control. The MC splitting his attention between those four as well as former demon enemy and former dark writer enemy (as my above suggested cast paring would leave you with) is still a lot to juggle. And that's not even counting Fade and Shade who should have stayed fairies so they didn't add to the overwhelming mass of haremettes I can barely remember all of! You gotta focus this cast down and assign some of these roles to existing core castmembers or relegate the extrras to minor supporting character status. It's just way too much of a good thing.
Don't let the people who are way too oversensitive about NTR prevent you from allowing any character no matter how minor from having another relationship --especially when that relationship is lesbian and willing to play with MC from time to time. L living breathing world means characters who have their own lives too, not just the core who are devoted to MC. Right now you have a King and his court and no citizens! The world feels simultaneously bloated and empty as a result of your unwillingness to tier characters in order of importance and put some down the list outside the MC's core circle.
*sighs, looks back up at wall of text* Ok this issue turned out to be so major I have no room for other concerns without turning this into a novel. They are the most serious, though, and fortunately they don't make the game / story bad they just keep a good story from being great like it has the potential to be.
LOL No worries on the wall of text... just look for my posts in this thread and you'll see much longer ones along the way. In fact, read on... I'll show you a wall of text
Yes, EVERYTHING you said here is completely true. Most people come along and find Serenity and will leave this kind of review and that's fine. But if you weren't around from the beginning, then you probably didn't know this was my first VN... Like... I literally was learning Renpy and HS2 WHILE developing it. In hindsight, there are a LOT of things I wish I'd given a good rethink. After the 10th day in the game, I didn't even realize the mess I was making. You see, its like digging a hole. You just get to working without paying attention to how deep you've gotten and before you know it, holy shit! I can't even see the sun anymore!
In all honesty, I don't really want to rewrite Serenity. I do want to go back and redo some more early images (and rewrite days 4 and 5 - yuck). But the issue of so many characters isn't as simple to 'redo' as you think. So that's why I decided that in Chapter 2, we would start spending more time with each of the characters we have. You kept mentioning that I wrote out Samantha and Camilla. I'm not sure why you think that. Cammie is going to start her writing in her little world, and we'll be going there later to see her, Samantha, and Cassie will be going there also, along with Shade of course.
As for Camilla... yeah. She really came out great. I honestly couldn't believe when I finished with her that I had done that. That ended up being a curse because now everyone wants her and I don't do incest and here we are LMFAO. Like I said, you go doing this stuff and at the time of writing and developing it all, it just didn't occur to me the situation I was creating. I get it... people read this and think "what the hell was the dev thinking??" In truth, it is definitely not so easy to do this and get it right. And there is also the issue of doing this alone; solo (no team).
Developing a game alone is a ton of work because you have to do everything yourself - write the story, condense it to work as a VN, come up with characters and names for them, create the characters graphically. Illustrate the scenes, pose the characters and give them expressions through each line in the dialog so you're not staring at one fucking static image for 6 lines of dialog (I hate that). Then music, creating animations, the coding itself. And outside of all that, real life, my actual job (I don't make a lot of money from doing this - at least not right now, so I do still have a full time job). With that in mind... No, I don't want to rewrite Serenity. Through this entire process of learning, being criticized (some were downright ugly and some still are), there have been many ups and downs. But I've always been as transparent about everything as I possibly can. I know it isn't perfect. And I know it can be better. But I'd rather press on - finish Chapter 2 and that will be the end of Serenity.
At that point (when Serenity is a done deal), I'll focus my attention on Last Human, and a possible offshoot of Serenity featuring Camilla, Shade, Samantha, and Cassie. (Maybe. I'll have to see if people would want that first. Maybe write something up and have people vote on it). I have another story on the back burner called Girl Trouble that I've considered making into an avn. There is a lot I could do. For now, Serenity Chapter 2 and Last Human are my main focus. I have a ton of content and ideas for LH, and a lot of stuff already written for it. The characters you've seen already in LH are the only main LI's you're going to see. There will of course be some 'side girls' but they will not be the focus. Really, LH is just a fun sci-fi romp first... and 'sex' game later. Star Trek with more sexiness if you will, perhaps not to be taken as serious as Star Trek. And of course, with Nekos.
Like I always tell people, I do appreciate feedback. But really if you just skim through the reviews for Serenity, most of what you said has been mentioned already. It isn't like something I try to deny or defend anymore. It just 'IS'. And outside of redoing the few days I want to redo (because I hate them), it will pretty much remain the same. I didn't create Serenity to be my magnum opus or anything. It was an exercise in learning literally everything about making a straight-forward, kinetic VN. And, for what it's worth, Serenity has quite a following with a lot of very silent fans. There is something about the game that certain people are enchanted by. I'm no master novelist or experienced author (most avn developers I know are just like me, not pro writers) but we do our best to make something we think WE would like... and hopefully some of you like it too... even with its flaws. That is what Serenity is. A vision from my mind written, illustrated, and performed with flaws unflinchingly left in place.
Serenity might have too many characters for some people, but jeez... have you seen some other games out there? Wow, I saw one with at least 50 girls! Having completed my first AVN and learning through that process, I can see now how easy it is to lose focus and feel like you need more girls while trying to make more people 'happy'. It's the lesson I learned and so it will remain that way because of that. As I keep doing this, hopefully I keep learning and writing better, and getting better at the art, music, and building characters. Before I started doing this, I thought it was an easy job writing a story and making a vn. There is NOTHING easy about this! LOL! So why do I keep going? I guess because I love doing it. And as long as other people love what I'm doing, then I'll probably keep at it.
Well, my wall of text might not have you beat. But there's my reply.