It IS still being worked on though, just slowly and in the background. KC seems to be a bit of a perfectionist when it comes to the game, I recall him saying something along the lines of not wanting to hand the development to other people for fear of them tainting his vision. Along with that, needing a translator that he trusts to actually translate it properly. So at the moment, I believe it's a complete one-man show from the coding to the art to the story, with only the translation being worked on by another person. Combine this with working on MGE itself, and... yeah.
He's keeping it fairly hush-hush in terms of releases, but he does give updates on his patreon every now and then. There was one not too long ago, though I don't remember what it said atm.
IIRC, I believe he's not going to be putting out another release until it's done, or at least until a certain breakpoint in the story is done.