Gonna give this a shot mostly cause the dev is Brazilian(from what I gathered), but let's see how it goes, I'll be making bullet points and this will get long as fuck so I'm sorry in advance.
1. the age thing as most people have said is very off increase the mother age by 10.
2. don't forget your "r", when we are speaking it doesn't matter too much but it does when writing and reading so that it can be understood "gosta" - "gostar", "chega" - "chegar", also you "o ajudasse" could just not have the "o" and it would be fine, also don't forget the "," so that the writing can have the right passing, I'll not nitpick anymore on language than this( I hope) but I'll leave this here as a heads-up to what you should keep an eye out for. edit: writing even in Portuguese needs a lot of improvement.
3. Mc feels a little too horny and indiscreet but that is par for the course and as a horny person I get it, just don't think the whole staring at a stranger's tits and then turning around to stare at their ass being my style.
well, that was short, not much more to say really, it is very cliche which is sad because since the dev is not from the USA they should use more of their (or in this case "our") culture and try to veer more towards that instead of doing the cookie cutter "Merican pie" porn story style, but yeah I hope they do well and grow on their own instead of just coping what came before.
now for my preference: harem, sharing, bi/gay content, none of the phobias(lgbtqia+-phobia and shit like that), none of the isms(racism, sexism, etc...), and always give us options on what the character thinks or how they think, probably more but I'll just leave the basics here.
edit: if the dev sees this and wants a pt-br version just pm me.