Last I heard he switched over from his other game Eld back onto Crimson Keep and is remaking it in Unity or something.
iirc he started eld specifically as a learning project for unity in order to remake crimson keep
Eld was supposed to be a small learning project to get accustomed to a different engine (Unify), since the Flash engine was struggling with the later CK chapters, the dev would spend more time exporting assets and running tests than actually creating more content and coding so a change was necessary.
Currently CK chapter 8 is being made on Unity, later chapters 9 and 10 will follow and will be added to chapter 8, only after that previous chapters build in Flash will be Remade in Unity and added to the other 3 into a single compiled version of the first Arc (extra content not available in those previous chapters can be expected}.