Prometheus did not abandon the game. He is working full time now and thus cannot continue it as a renpy project. He has been working on translating it to a different medium, be patient.
From his discord announcements:
However, whether I finish the game as an AVN or not, this will not be the end of Evermore. I still fully intend to see the story through to the end because of how much I love it, though it’ll likely be in a different medium.
-Next time I announce anything, I intend to have a lot to show for my time missing rather than just cryptic little hints and it'll basically be a free for all when it comes to questions since nothing will be hidden anymore (besides plot spoilers)
-I'm aiming for a summer announcement, but it'll all depend on how quick my progress is, so it could be sooner and could be later, but that is my target. (If I can't do the full announcement by august, I will at least give a progress update on where I'm at)
-The stories of both Evermore and Dawnchaser will see the light of day again.