But, IIRC, at the end of Season 2 they teased the coming of Season 3...This Ren'Py version is already complete besides the VO....story wise done...
...and since the WTF-plot-twist of Season 2 ending (which completely killed the player engagement), I guess that most of us who loved Season 1 and the beginning of Season 2 are much more willing to play a new Season 3 with the old engine to see if they somehow succeed in saving the story with new ideas, rather than seeing Inceton spending Patreons funding in rebooting Season 1 on a new Engine.
(Or at least finish Season 2 of Mia... too many unfinished projects to pop up new ones, especially since they are funding themselves with Patreon donations)