Thanks! The premise is that after the battle the magic in the RoR is broken due to all the damage. So she ends up in some dark/twisted place that builds itself off her memories and then other people you meet who are also trapped down there. So it's like the Backrooms/liminal-space games, but set in the HP world rather than a modern one.
I'm still working out the last few 'levels' and where/who you meet at what point and the lore behind it. To begin with, it's a bunch of Hermione's memories and she spends the first part of the game walking around alone, but finding blood and other evidence left by survivors in the past. Then you see messed up versions of the school and other places she knows and eventually catch up to and can decide to team up/trade with other people in there (at least the friendly ones).