Game got abandoned for other projects appearently
The original game's renpy version came out receantly, with most of the original content included.
As far as I heard, besides a handful of missing feathures (Lobo's daughter, Meta Bordello, Livewire scenes in the club) it's pretty much complete, including side areas like Gotham, Almerac, Themyscera, etc.
I would assume that moving that much content over from Unity (C#) to RenPy (python) is a big hassle. I mean, it's a completely different engine, that uses a different language.