Well, I played it, and it was playable, but had some quirks, mistranslations, and an untranslated parts (like Estel's presentation/lecture, where AFAIR text was in the form of the images). Overally, it shows that it's unfinished. From my "review-ish" post:
Despite the translation problems, I loved the VN. I think one day I'm going to replay it in Japanese