I like what you have so far! There aren't too many isekai if's, so it's nice to have another one with such an interesting plot. One thing I noticed though, is that my character was still referred to with they/them pronouns despite choosing she/her. That, and when clicking any of the buttons on the side like Character Stats and then choosing to return, you are bought to an empty page so you have to reload if you want to get back to the story. I also got a few errors.
Besides that, I thought this was a good beginning to your game. I can't wait to read more!