The spinoff is okay, but honestly it feels like wasted time and effort by the developer when they could have been making a Lysteria 2 or (my preference) Frostia 2, or even a continuation with a new magical girl. The fun of the magical girl premise is just that, playing as a magical girl who can be defeated and go through the usual tropey situations. The spinoff could happen in pretty much any other hentai rpg, and there are entire games that explore the premise better (Baron Sengia games are built on the idea for example, with sneaking, puzzles, etc). It feels like a waste of the magical girl premise to me, from one of the few developers actually using it.