Overall not a bad first impression but I can't say that I am blown away - yet.
I am usually trying to state my personal opinions in a "what I liked" - "what I didn't like" fashion. I think it is too early for this approach because there is not a whole lot of content. So I'm not going to put in a rating but instead here are a few bullet points in no specific order for the dev if they feel like reading them.
The English is not super bad but not good either, could use some proof reading by a native speaker. Also random switching to Spanish. Also, who is Juan? Or Ella? Sometimes the text is attributed to the wrong person (MC instead of a lady). Sometimes the customized relations are disregarded. It looks like there is some cleanup required.
There is no clear distinction between the spoken sentences, the thoughts or the exclamations. All blend together in a stream of words. Give your - in this case - readers a clue about wtf is going on. Yes, I can infer from the context but it makes for a tiring experience.
Little sis goes from "working together in silence and ignoring each other" to "I trust you, big Roommate" within a very short time span and that makes it very implausible.
You may want to reconsider the way that you define the relationship at the start. It is obvious what you are going for but when you put in the relationship of your choice - no judgement here - capitalization or not, could be relevant. Also dark font on dark background is not pleasing to the eye.
Text boxes and standard renpy menu overlap at times.
I don't know on what planet cooking would be taught at a university. Don't get me wrong, I adore good cooking and it takes a good deal of training, knowledge, skill and inspiration but academia is not the place unless you want to dig into food chemistry.
Maybe just my personal preferences but some of the models are hideous (like Victoria) and some are very nice (like Maria, yum). The 3 main ladies are somewhere in between.