Went through both games last night and I find this one an upgrade over 2, despite the character framerate issue still being there.
The demo made me think we had secret areas back but I was fooled, they actually made branching paths for most levels, which is an interesting decision since it also puts path-exclusive enemies in each level (not that it matters much since once you clear a level all mobs for it are in the gallery, but hey, that's a bit of replayability incentive). Definitely the most "game" feeling of those yet, what with each girl actually having a different moveset (2 were basically the same, aerial attacks aside) and the enemies not all going down in 1/2 hits and actually trying to hit you. That last bit is important because I ended up having a much harder time with Sasha than with Minya (though I also did Minya second, so I knew the levels/mobs by then), I actually had to use the guard button this time.
I found the final boss really easy with both girls, though yeah, Minya has a bit of a harder time hitting the boss (although the self destruct attack for her magic special will deal some chunky damage to help with that).
Also once you get the extasy meter to 4/max it unlocks a door in the gallery that leads to about 5 NPCs with their own animations (and while 2 of those appear in the level up events, 3 of these only appear in that room).
The way they did the extra stage was pretty funny this time though.