Great potential for this! It's not unlike something I was tooling around with in Twine, but mine was in a fantasy setting and more narrative-based. It's good seeing more player-as-submissive content!
Although, a thought or more from my part...
The big one is, there doesn't seem to be a clothing mechanic and the description doesn't include any idea what the PC is wearing. I'm assuming given the game's content the PC is naked, but that could use a little clarification.
But on the other hand, a clothing mechanic would be very much welcome, including the option to wear clothes or not depending upon what the captor allows.
Being forced to go nude would be a good punishment, so long as there's an option for the character to either mentally resist their nudity, accept it, or even embrace it, even later in the game when it comes to players wanting to exert one kink/fetish over another. Resisting it could cost willpower (from being cold and exposed) but drain submission and raise humiliation (more on that in a sec), accepting it could be willpower-neutral but raise humiliation and submission, and embracing it could raise willpower but massively increase submission and exhibitionism.
The player's opinion of nudity could be easily coded, by considering it different clothing states with stat ramifications, but the same impact on gameplay and narrative. Or, a conditional which comes into play if the character's clothing state is nude.
Likewise, the captor could provide a range of erotic, fetish, humiliating, or sexual clothing which the character could choose to wear or not, with willpower-, arousal-, and submission-gating (and ramifications on punishment/reward) if ordered to wear them opposed to being given a choice. This is where chastity could also come into play, by including a number of chastity belts which include vaginal or anal dildos, vibrators, and the like, shaping the PC as the captor "sees fit".
[EDIT: PC hygiene needs to play a role in willpower, submission, and fetish stats as well. Being covered in cum, or I'm sure later once the content is added piss, especially for protracted periods of time, should have major ramifications for the character's mental state. That would also add the potential for a "bound bukkake" punishment, too!
A catch-all hygiene stat would be nice, too. PC's are going to work up sweats and get dirty from fighting, fucking, performing on webcam, and all sorts of other things to be added in the future, and likewise their hygiene level should impact the PC's mental state and attractiveness. Which means baths or rinse-offs would become a valued reward to prevent long-term slave progression, even if it comes with a short-term submissiveness hike.
And, I recognize this may not be everyone's cup of tea, but there's huge potential for fetish crossover material here. Like for example, giving PC's the option to wash off cum with their own piss, or the captor instead of wiping cum away with a rag giving them a golden shower, trading one form of humiliation for another but with no actual hygienic improvement. Or even the PC covering themselves with their own piss to put their own hygiene -- and attractiveness level -- in the toilet (pun intended) as a form of resistance against their captivity.
And, of course, if there's going to be a hunger/thirst mechanic, allowing PC's to wash themselves with their own drinking water, drink their own piss to stave off thirst, and the like.]
Last in terms of character appearance, on top of tattoos and piercings (which would be awesome!), and what I'm sure would be hormonal treatments to change physical attributes on top of M<->F transformation, it would be nice to see the captor deciding player hair color and style, makeup, and even body/pubic hair.
Now, my second point...humiliation isn't the same as exhibitionism (to a certain extent they're opposite sides of the same coin).
Humiliation doesn't necessarily involve exposure, and exposure doesn't involve humiliation. It'd be better to separate the two and give them individual stats, with appropriate content and stat influences. Although I will grant, when it comes to events which involve the exposure of the PC or engaging in sex acts in front of others, that will largely depend on the PC's mental state and an element of choice as to how they view acts -- just as my nudity suggestion, in many cases there would well be an option which allows the player to leverage willpower and submission as they mentally resist the act (humiliation) or embrace it (exhibitionism).
Outdoor or straight-up public sex acts would be a great way to manifest this...just saying.
Building on that, my third point...the player needs more options to build, conserve, and leverage willpower and submission. I think there should be an option beyond "perform" for most acts, "embrace" or "indulge" which allows the player to gain willpower (maybe gate this behind slave level for certain, or most, acts) for throwing themselves completely into the given act in exchange for greater submission/reward. This would allow the player more leeway to resist some or more of their captor's demands, and shape themselves as a slave, even subverting their captor's desires for the slave which could impact ending(s).
And, willpower shouldn't just be for resisting acts...it would need a mid- and late-game use as well, especially when it comes to later influencing the slave class the PC may become. Which, in turn, incentivizes continuing to indulge oneself in acts demanded of the PC. Because, I can already tell in higher slave levels the PC will end up with excess willpower, but is too submissive or aroused to resist an act despite it, and it's a waste at that point.
This could work well allowing PC's to beg their captor for given or different events (for instance, being the subject of a gang bang instead of working as a cam whore), body modifications or clothing, hormonal treatments, receiving bondage or pain, sexual release, or servicing their captor. Leveraged against reward level, of course. This way, willpower has a use later, and at that point is inverted from a mechanic to resist breakage to a reward mechanic for being a good and obedient slave.
Which is kind of the heart of what a game like this would do well to be, moving into my fourth part...the player needs to be given "lose-lose" choices, which requires them to play carefully, think about what they're doing and their kinks, and leverage their meager mental resources carefully lest they become a completely mind broken sex slave. Depending on stats like reward/punishment and the strictness of their captor, and slave level/class, things like "accept a genital piercing now, or eat only smoothies for a week dispensed by a dildo-straw". The former increases submission and libido/arousal, but the latter erodes willpower, and increases humiliation and oral sex...it's a lose-lose and strategic choice, since the former increases slave progression but preserves the player's ability to determine what type of slave the player will be by conserving willpower, but the latter limits the player's options with regards to what fetishes they can resist and exposes them to later shenanigans by their captor (including, potentially, being forced to accept the piercing later
anyways).
And, last, the captor(s) would do very well to have different goals and objectives. The "inexperienced dom" should just be happy having a perfectly submissive slave; the "moderately-experienced dom" should have a distinct slave class in mind and work towards making the PC that class; the "experienced dom" should want a perfectly-broken sex slave who can and will do anything. For this, a hidden attribute, "desired slave class" would be necessary, which would weight events accordingly (the inexperienced dom would prioritize events which increase submission the most, the mid-dom would prioritize events featuring given fetishes, the experienced dom would prioritize the player's
least-developed statistic*). This way, the player could figure out based upon the captor's choices what they
want the PC to do, and work to resist, subvert, or even embrace their captor's vision for the character. Which could have
interesting implications for the game's ending(s).
[* Why the least-developed statistic? It simulates the captor experimenting with the slave initially, figuring out over time what the slave wants, and more importantly doesn't want, to do, and targeting that to break them, i.e. force them to expend precious willpower to increase submission in the long term which will eventually make them pliable to the captor's demands.]
[EDIT: Non-sexual events would also be a good addition. Making the PC clean the captor's home, serve refreshment at parties, see to the captor's health and beauty needs, being made to exercise to improve their appearance, provide non-sexual companionship to clients, and the like would be a good way, especially early on, to erode willpower and increase submission, and provide reward, to PC's without jumping straight into sexual acts, or straight-up mind-breaking. Especially for the easier-going captors.]
Just a few suggestions and comments. Keep up the great work!