Hey very cool game, I like the stat driven gameplay parts loads of room with perks/modifier to change it up in the future, don't want to pile on ideas when i don't know the roadmap.
I did run into a progression blocker with the "Angel" character when i couldn't lower her purity beyond the first intro sequence of the game, not sure if that is just a WIP scene but all the others had a end of content message so a little confused.
But all in all best of luck with this
p.s. for the combat, it could be interesting to spice up the actual gameplay once you decided if you want to keep it based only the MCs choices right now or make it more turn based. I do think you can do something cool with a "Phased turn based combat system" making it more strategic and also keeping things open for more kinky stuff but that would be a lot of work.