I'm gonna have to agree with Void. While I don't think the gameplay is bad per say, I do believe some variaty is needed in the enemies. So I'll list how the enemies work and how I believe they could be improved.
Morgana is directly linked to sanity from what I can tell, and will only enter when at around a third left. As long as you keep your sanity up, she's a none issue. However I'm not sure that's how she's intended to work considering the mechanic of shutting the windows.
Seraphine will teleport between two cameras. As long as you look at her through them every now and again, she won't come into the house. And even when she does, I've found her very easy to avoid.
Judi is where you can really see the FNAF reference with the music box. Just keep it wound and they're not a problem.
Here's how I think they could be improved.
Keep Morgana tied to sanity, but only in time it takes to enter the house. So the less sanity you have, the less time you have to shut the windows. This would make her an ever present threat that you constantly need to be taking care of.
I think Seraphine should be completely reworked. I can roughly think of a couple ways it could be done, although I can't think of anything perfect right now. 1: Let her work together with Morgana, teleporting from window to window and using the flashlight to make her go away. 2: Let her teleport around the house in spots to block your path, keeping you away from certain objectives to make things really hectic. Or maybe let her block off entire rooms. So that way you still need to use the camera to check where she is so you don't run into her.
I think Judi is actually ok as what she is, but it could be done diffrently to make it more unique in flavor. Instead of a music box, make is so maybe the player has to interact with the book upstairs for example to keep her calm. That would go a long way in letting her feel more unique and on theme.
As for the lewd aspects? I think they're fine as they are. Maybe some color presets for hair or skin tone? So that way you could make Seraphine blonde, or give Morgana a darker skin tone without the limitations and frustrations of a color wheel.
For something that only just released, and is in the initial proof of concept stages, I think it's fine. There's plenty of potential, and with a bit more elbow grease could be made something pretty good even with what's here now! I look forward to seeing how this game might evolve in the future.