The creator (to my knowledge) is still working on it, he's just never really been timely about releasing public builds. His patrons are usually 2 or 3 builds ahead, and the public only gets an update every couple months.
Just as Static said, lately, I've been updating the game here on itch.io less frequent, but because of that the new public builds are bigger. You can see the actual progress (the new builds and their release dates) in the changelog.
