I played season 1 only; I know the original dev retired so I guess this is more of a review than feedback. All in all this AVN has good writing and I'm always a fan of that. Beware that there's a considerable focus on horror!
Visually it's not that strong, especially the UI, but the characters look pretty good and that's what matters most.
For my tastes, there are too many LIs and lewd scenes are too frequent and often lack intimacy. Didn't bother me too much though, most of them were quite creative.
I have to say that the last 2 chapters were lacking quite a bit, mostly in terms of scene coherence and animations, that brought my opinion down a bit at the end.
Overall there are a lot of cool ideas here, could be more polished, but it's still very much worthwhile. It's an AVN worth continuing and I'm curious to see how the two devs who adopted it will carry it further.