I'm writing my thoughts as I play, so forgive the train of thoughts. Mosca is cute. Haydn is also cute. The story is intriguing and the writing is very good, in my opinion. Only a few minutes in and you've got me invested in the, so great job. The music is all very fitting. I like the way you show whose turn is coming up in battle, it's cute. This first battle feels a bit long, but the skills and spells available to your party are pretty interesting. You might consider adding an auto-target toggle, or have attacks automatically target the last remaining enemy to speed things up slightly. I didn't realize that waiting increased your SP rapidly until the second battle, but that's a nice feature and should speed battles up a little.
I'm starting to enjoy the slower pace of the battles, and I can see why you designed them this way, so you should probably disregard my earlier thoughts. I'm leaving them there since I imagine initial impressions are valuable regardless. It feels like the optimal strategy is to pretty much just keep Mosca alive so she can try to sustain everyone else so far.
Ermine is cute. I really like the art all around, it's cohesive, charming and very well-made. I'm still playing through, but I'm enjoying it quite a bit. Great art, music and story, fun gameplay, and very polished so far. If I run into any bugs or issues, or if I find anything to complain about, I'll update this post.