Idk man, I kinda liked how the characters looked un the demi. Yeah it's more polished on itch, but I still kind preferred the old character designs. Something feel too different from the characters appearances from demo to now.
The new art is leagues better, and so are the designs. The two characters definitely have a more distinct look from each other and the outfits, especially the casual ones, present a lot more detail. The problem with the art style change is that it creates a sort of whiplash regarding the expectations that were set in the demo.
The previous designs felt a lot more grounded and less fetishised, and the good magical girl's design in particular wandered off into the anime MILF territory, now looking a lot more mature than her evil counterpart. Whereas before, the two girls were like one side of the same coin, mirroring each other in how they are merely looking to use you, now, it feels like the two girls are more distinct in their design and personality. Great if you're looking for variety, but disappointing if you liked the previous iteration as is, since you feel as if you're only getting half of what you expected, especially so if you don't particularly enjoy the MILF design direction.
I'd still give this one a shot regardless of which side of the argument I'm on, since the premise is unique enough to still come out as a great VN, whether it's tailored to my own personal fetishes or not. After all, this is a VN where different playthroughs depending on your choices are possible (or I at least hope they are as with many other VNs), so you can probably tailor your experience based on what you want to see anyway with how the evil girl stayed mostly the same.