I liked this a lot! It's very sweet and fun. The art is super cute, I enjoyed meeting all the characters, and I immediately felt immersed in their world. I wanna be a potion maker too! I think this can absolutely measure up with professional visual novels once it's got that last bit of polish. I also couldn't help thinking that it would make a great novel and/or graphic novel.
Now I'm not a visual novel expert, so you'll be a better judge of this than me, but one potential issue is just the balance of time talking vs time potion making. I'm estimating there's about 1 potion puzzle per half-hour of gameplay, and if the potion-making is really fun, it might be disappointing that there isn't more of it. I'd also appreciate if there were some conversational choices.