I did a little bit of exploration in your story, and there are several things that I like, that should be incorporated more frequently. Firstly, Death mocking you when you die is a nice touch that I really didn't expect. The characters are also fine, you've got a self-insertable protagonist and a few characters with interesting backstories to match.
There are a LOT of things that I find concerning/strange, however.
Firstly, there is an absurd amount of branching in this game, and I've read enough of the other branches that you haven't made too much progress on to realize they aren't going to loop back together. You might need to cut this down a little, cause we aren't even past the second day of training, and it's already at 8k words. Unless you plan on turning it into a romance story with Aunrae, if you actually are going to make it a game fitting of the "Fantasy Adventure" genre, the pace is way too slow. There's unique paths already for if you become a rogue, different weapon choices are gonna have their own consequences, and that's not including the ENTIRE ANGEL BRANCH which I assume you'll want to make at least comparable to the demon one.
Secondly, I know what you were going for, with the meadow scene during the second day of training, but I don't really know if it works. This is supposed to be HELL, after all, and even though I like how the magic has a natural basis, maybe you should explore the beauty of something like HELL instead. I imagine that having sparring matches in the middle of a field with lava rivers rushing around you might be a little more intense, and might open up to some comedic possibilities as well. After all, your character is super new to this world, so seeing their first LAVA RIVER might spark some interesting reactions, and you could use that to create better bonding moments with Aunrae, which, leads to the final bulletpoint.
Lastly, to address your bit on whether the character change is too drastic in the last scene you wrote with Aunrae, no, I don't think the character change is too drastic. You laid out the foundation with her being concerned for you in the tavern just fine, but, here's the thing. I don't think you as a character, have really done anything to garner interest yet. You're fodder at swordsmanship, and don't speak at all. The most you've done is buy a sword from her, and like, cool. These last two are more opinion than anything, but I hope you consider it.