Awesome game! The presentation is fantastic, and the art is very cute. I must say, the battle transition in particular feels so... professional. The first person dungeon crawling reminds me of early Persona games. All in all it feels like I'd find this game in a list of PS1 hidden gems, and I love hidden gems (I go for PS1 because I'm older, lol).
I must also mention that I love how you mixed 2D sprites with 3D environments. There's a lot of potential there, especially when they are so well blended together like in this case.
The music fits great with the vibe of the game, and the sound effects are pretty sweet.
Finally the combat is fast and satisfying with plenty of enemy variety. That's a lot of sprites!
I'm eager to see how this book returning adventure finishes! I'm rooting for Alice and Patchouli (and Shanghai)!