Well, I know I'll be in the minority here but I found the true ending to be a bit disappointing, it definitely wasn't as satisfactory as I thought it would be. Like, it was fun to put the pieces together from each playthrough but you can easily deduce what's going on if you've been paying attention. The narrative is not very subtle. And because of that, the so-called great twist didn't really impress me.
The payoff of the two big mysteries; Zero's identity and Alice, were pretty underwhelming. By the end of the safe ending, I already knew that Zero could only be Santa or June by process of elimination. And about Alice... why on earth would you build up such an interesting and mysterious character if she doesn't matter at all in the end? Idk. I also found the puzzles to be pretty annoying for the most part.
If I had played this VN 10 years ago maybe I would've thought that it was incredible, but this kind of story simply doesn't surprise me anymore.