I read several chapters in. The vagueness gives it an ethereal, dreamy, experimental feeling throughout, but the lack of names or specific traits makes it hard to connect with your characters or to pin things down. It also makes it hard to picture what's going on when you add a third character - if the characters are "She" and "He," then adding another "He" is distracting. They could at least make up names for each other. Combining that with the minimal-to-no dialog, and that dreamy experimental vibe really shines through.
The story made me think of the song "Gelfling Song" from the soundtrack of The Dark Crystal. That's the vibe so far, as of the first 10 or so chapters.
I've stopped reading further because I can't give you a fair evaluation, I'm not a fan of isekai or video game settings.
You don't have to avoid the specifics. If I find out her name is Molly and his name is Hun'terr, that wouldn't reveal anything about the world to me. If he names her "Meadow" because that's where she is when he sees her first, and she calls him "Greymane" because of his hair, that wouldn't reveal anything at all, but it would clarify the scenes a good bit. Humans name things.
But other than the names, the story is so tropey that I didn't feel there was much mystery otherwise. Why is she waking up in a video game fantasy world? No reason needed, that's just what happens in the genre. Where did she wake up? A generic fantasy starter zone. Who's this guy? Some hunter love interest, bet he has some edgy backstory. Where are they going? Some MMORPG small town, probably. From there, they might make their way to a bigger MMORPG town, and then a city. There might be some adventure-type hurdles along the way.
So what's the mystery? Everything is proceeding as expected based on genre conventions. To create a mystery, somebody or something has to behave in an unexpected way so that the audience wonders, "Why did they do that?" or "Why did he do a triple backflip and explode instead of saying 'hi'?" If she had an unexpectedly high level of skill indicating that she's been isekai'd before, or he was a poet who is always making up verses and singing them aloud as he works, there'd be a slight variation on convention for the reader to latch onto.
I usually say that the two things the audience needs to learn about a main character as fast as possible is "who are they?" and "what do they want?" - that's what lets us get invested.
