I played the demo (though I should stop, some are too great and are going to kill me since I need full games that are as interesting...) and I obviously loved it.
At first I thought the art style wouldn't work for me (I might have been used to art that don't look as good, I dunno, and maybe it looked too detailed on the phone) but I was blown away when I actually saw them on my computer screen (no exaggeration, I really loved it, characters and background really do look good).
I think the only problem I had is with the teacher because of his profile that looks completely different (but I understand, profiles are quite hard and annoying too)
I enjoyed the characters, too. In particular Renan and Hyde (because of personal tastes but well, Renan is particularly funny and Hyde isn't just the quiet guy that won't talk to you. I guess Kary is interesting too, just less my type, but at least I know I can consider his route without problem)
And obviously the world an magic are just too interesting. It feels really nice, and I hope its good development isn't just in my head x) Because it really is interesting and I like how it's going. Too bad the demo didn't end in a really exciting way for me, though I still hope to see the full game.
And I forgot at first but I like Rave's personality, he's not just nice, he can be agressive and everything, which felt... surprising in some cases x) but otherwise it's nice.
One question: Will there be an hint system ?
Best of luck for the development of the game !