This has some really original gameplay ideas, although it's kinda frustrating go all the way through a few floors and then realize you've run out of energy and have to do them again with basically zero value to that replay.
I couldn't figure out what the familiars are used for once you've unlocked them. I'm not sure if I played the entire game without a significant chunk of functionality, or if they just aren't implemented yet.
I also couldn't organically discover how to play as other characters, which looks possible from the gallery.
I do like the NTR aspect, although I wish the characters took it more seriously - their reaction is basically 'ok'. Also it's nigh impossible to organically discover how to get your ally to be kidnapped without reading instructions out of game somewhere. While it was a great call by the dev to have levels of progression to the scenes with each boss, what I really wanted was some sort of progression of the NTR characters' relationship tbh.