Yep. And despite the tendency of some folks to rip on people who let that happen, it's actually fairly common on a variety of sites: Amazon, DreamsTime / similar image asset sites, an online newspapers subscription, etc. Even month-to-month can fly under the radar if you're not paying enough attention.
You should ask this over on the Recommendations and Identification forum, specifically set up for questions like these. FFR, site rules now say that this type of discussion should not happen in a game's thread (see Rule #2.4). Just FYI.
Mixed feelings. For the most part yes. But again your looking at a dead game. Would have loved sis to have been a thing. And the mom is only a thing in a dream or an illusion style occurrence.
Yes, the story was interesting but obviously far from being complete. It's still worth to play. Do not expect the developer to finish it because he had disappeared and his accounts have been closed. He also abandoned a newer VN.