That sounds awesome Ellise! That's a great way of doing it! Like Dante's Inferno, Diablo series or Devil May Cry in a way. Among many other great games. Especially if it's going to tell a story why she's going through all of it. Might even teach some very valuable lessons along the way ^_^
You should be positive about it, that's a very ambitious idea. A good goal to work for. I wish you all the best in making it. It sounds like you have a great plan for the game. Certainly surround yourself in lore and things like it during development and I'm sure you will have plenty of material and inspiration to work off of.
Making the game one level at a time... 🎶😄😉 Cheers! ♥