So far, the art is good & the game has a lot of potential. Since it is at the beginning of its development, I'll throw in some constructive criticism. To preface, I finished Lisa & Amber's quests. I am also someone who played a lot of Genshin Impact prior to Fontaine.
Dialogue: There is just way too much dialogue. I'm glad you have a lot to say - as not enough is harder to fix in my opinion - but there is just a lot of unnecessary dialogue. There is also some strange dialogue because things like Amber telling a story about her being found nude in the hot springs sounded more like a big deal than it really was.
Story: Lots of potential. I really hope you expand to Liyue, Inazuma, and more. Didn't seem like you focused too much on the main story (finding Lumine), but that's okay. There were some continuity errors like when meeting Lisa for the first time when you are new to Monstadt, let alone Teyvat. I do like that the story is close enough to Genshin Impact without being exactly the same.
Gameplay: Good so far. Not much to say here as it is just the city of Monstadt with not a lot to do with money. Looking forward to what else is implemented, but obviously it is a VN, so not expecting anything too crazy, lol.
Scenes: The art for this game is fantastic. I believe that this game needs more scenes both SFW and NSFW as there are a few scenes described, but not shown. The dialogue box does hide some scenes sometimes, so maybe consider panning some up or zooming out.
Other: I do think that blocking the gallery behind a paywall isn't a good idea as players can just save beforehand anyways. Just seems like an inconvenience.
Like I said, so far so good. It has a lot of potential and I really look forward to what you have planned!