Nothing at all wrong with liking (or having) big boobs, but if I went into the comments for every game that has grossly oversized breasts and said "needs smaller boobs" I'd be at it all day long.
I'm not here to pick a fight with anyone, and I have no investment in this particular game. I just find it frustrating how people who are generally in the majority to begin with so easily feel the need to complain when something doesn't fit their expectations. I've seen the same thing with female protagonist vs male protagonist. There are way more games with big breasts than not. And many of the games that have more petite characters also include curvier ones because they want to give options. There are hundreds of games on this site I won't touch purely because I don't prefer the art-style or body types of the characters. But there's nothing wrong with the characters, or with me, it's just not my preference.
I'm not here to tell you what to do or say, I hate drama and I'm apprehensive in even posting this. But please understand that your perspective isn't the only one, and it can frustrate others when 60% of everything is one way and you still have to hear complaints when something has the audacity to not match the mainstream.