This is a bit of an early review, but I feel like I need to express what I have experienced so far. I actually have quite a bit of criticism for this game. It is not uncommon for me to be the only one complaining about a game/story, but I knew I would have to do it when I saw all of the glowing responses that seemed too good to be true...
The writing is actually the most conflicting part of this game for me. While the amount of work done on this game is incredible (most major visual novels of comparable size are using multiple (ghost) writers and yet this is a solo-project that is more ambitious than famous visual novels from Japan that cost $40 or more), the writing is inconsistent in many ways. First of all, after meeting the first five characters, it feels like too many characters are going to be girls and all of them are basically idiots. The main character sounds pretty normal, but the dialogue from the girls so far is way too off from the setting. Everyone is talking like they are casually chatting on the Internet and there are even lines that approach meme humor. And everyone is way too sarcastic as if they are not actually experiencing half of the things that are happening. Metatron is an exception to the rule, but it feels like you are just restraining your tendency to write characters that way by writing as little dialogue as possible for her. You also claim that she thinks really fast, but nothing she said so far displayed rapid thought beyond human levels and she is in some ways slow to be reasonable.
The descriptions on the other hand, tend to be very serious and like a literary classic, but they also can do a pretty poor job at explaining things and the background image of the area can feel detached from all of the descriptions. It can be really hard to tell how the scene is flowing and sometimes words are dropped to the extent that it feels like thoughts were forgotten. And character motivations and personalities can seem so inconsistent. There is this one scene that sticks out in my mind where Ashley walks backward in fear or something (the description was not clear) and then Sarah randomly said something like "How incorrigible!" when Sarah had been talking like everyone else up until that point. There also is the fact that the first thing we learn about the main character is how they wanted to save the world even if there was no apparent threat... Yet, everyone including the main character treats it as a joke and a childish thing that should be forgotten even though the adventure has clearly become real at the beginning of the story. And the description of characters' thoughts and reactions can be so anime, as in people reacting in ways they should not just because certain anime-esque situations come up that are always presented the same way in an anime. Basically, the characters seem like they are held back because of constant playful aggression, sarcasm and "obligatory" actions. Oh yeah, and the main character talks to his best friend with male terms, which seems like such a modern and unnecessary way to express a friendship. And why does Sam feel so much remorse over her actions when she was so careless in a completely important and special situation as if none of it mattered? It came across as completely fake to me. Lastly, I am almost certain that Metatron gets compared to an alien, but why would any of these characters come from a culture where they think about aliens? Some of the descriptions gave me the impression that beings already are capable of interplanetary travel, as well...
One last oddity I noticed is that sentence structure is quite wild. There are some crazy run-on sentences, some which switch perspective or subject in a way that clearly should be a new sentence. And then other sentences were really short.
I am probably nitpicking way too much, but I just wanted to get these things off my mind and maybe hear some background as to why these things may have been written. On another note, I have a pretty strong vocabulary, but this story has brought up like 15 words that I did not know or was unsure about, so far. I feel like the intense vocabulary (mainly in descriptions) is what is impressing so many people. I guess, there are also quite a few descriptions that are beyond my ability to write or imagine that employ that vocabulary.
Edit: Oh, one last thing. I do not understand why everyone "rips in half with a glare". This is the most consistent phrase in the writing and is really bad hyperbole and feels like only one character should be doing it. And the main character is kind of grating with how they use a swear word in a bunch of sentences that should be more calm.