It’s also worth noting, that there are TWO all-ages versions of this game, and there are slight differences between them - but mostly in Episodes 3 and 4. The Steam version is a bit more cut than the Japanese all-ages version from Complete Edition by Palette.
I’ve summed up the differences in This post at Fuwanovel forums (hidden by spoiler tags) - there’s one scene missing from Episode 3, and some CG differences.
As for Parfait Queen’s heroine potential - she’s the heroine of Episode 4, so you’ll have to wait a bit 