There is a shocking amount I can talk about here considering how limited the scope of the game is at this point, but there are some things that really stuck out to me here.
I want to note a few things about the main path (that is, you open the box). There are three things I really like about what's so far available here, the first being, somewhat surprisingly, the actual lack of sexual content at the moment. I can't help but feel that many games that include sexual content put too heavy of a focus on it, so much so that it seriously subtracts from the rest of the experience, while games that don't include it often act as though it simply doesn't exist. The world is a big place, and there's a lot going on, so I appreciate that while it's clear from some of Margerie's behaviour that the characters are concious of it, they also don't act like horndogs who can't recognize that now isn't the time.
Secondly, the magic system as explained so far seems reasonably well-expanded on. I personally love when these kinds of things are built in a way that the reader can understand and follow, rather than it simply being said "It's magic" or throwing a lot of terms from out of nowhere to make it seem impressive. As is, it seems to be at a point where it can be made sense of to the degree currently necessary, though I am left with several questions: If the Blind have Essence, but not Vitality, could they cast essence-based spells? Who are "Dark Mages" and how did they remove the Vitality of the Blind, is this related to the downfall of all other known magical institutions? What exactly does an Affinity do, since a mage doesn't seem limited to spells of their Affinity, is it just a matter of acclimation? Do spells of your Affinity grow stronger? I expect Water and Earth Affinities are the easiest to acclimate to, if they're used for Apprentices, but what are the other Affinities and how are they defined?
Lastly, I think the characters actually have feeling to them. Obviously Rudy and Austin don't have any real role at the moment, but even they feel as though they have defined personalities and could realistically be there. Azrael seems like a fleshed-out character. I especially love how the MC has inner-dialogue relating to stress about the unfamiliar situation, it makes them feel more real rather than a bland self-insert (though, I do think it would be nice to be able to name the character, it eventually starts to feel odd only being referred to as "you").
Of course, there are some low points as well. Starting from the top, everything about the box is abrupt. To some degree this makes sense, having a sudden revelation thrust upon you is the spark for the story, but then you're just teleported there. The MC has no thoughts about family, friends, or their former lives, in fact, they're not overly concerned about anything at all it seems. The MC is actually incredibly inconsistent, their inner-dialogue often makes sense and conveys their nervousness about the situation, but if they talk to Margerie they declare that they're powerful, when at this point they have no idea what's going on, or if they talk to Dahlia they swear to become a noble mage, when at this point they have no idea what that means. There's such a divide in these behaviours that the boisterous dialogue seems more like it would come from Margerie. On that note, Margerie also has some odd behaviour. She's clearly a proud individual from a prestigious family (though she seems to have little actual knowledge based on her dialogue with Azrael, which is odd if her family is that prestigious) and is described in the relationships menu as an airhead. Neither of these really sticks however, as aside from her lack of knowledge she doesn't behave in an airheaded nature, and her immediate segue into seducing you after you cast a fairly straightforward fireball/repair spell doesn't fall in-line with her proud nature (that alone would hardly be enough for her to accept you). There are also a lot details that aren't explained to the MC, for example, Azrael explains that the red Affinity is due to corruption, but doesn't comment on the blue. The MC actually has a thought about this, but doesn't ask, and I have to wonder why? This is immediately after you can trust Azrael not to kill you, so it feels weird that you wouldn't trust him enough to ask a pretty obvious question. Azrael also casts a brand on the MC to monitor them in relation to not speaking of their corrupted nature, but this brand seems to behave improperly as it reacts any time magic is involved (there's even a line where Azrael notices this), seems like a pretty substantial hazard, but you can't ask about that?
As a whole, It feels as though things are just being constantly swept along with little thought when the MC should be bursting with questions.
In relation to what's available if you ignore the box, I think it's a very good example of what the sexual content of the game could include, though I think it's pretty silly to have there.
With all of that said, I'm very interested to see where this goes in the future. I know as of now this is more a conceptual example than anything else, so I apologize if I came across as unduly harsh, but since there's stuff here I like I wanted to provide my full feedbdack.