I guess it's not going to be released...
Viewing post in When will the full game come out?
From what I can gather, Navi posts an update like every couple of years about working on it. Last update being in Aug 2021. Which makes me believe that it could be abandoned, or the work on this project is just on the slower end. I would love to see at least a post from the team saying they are still working on it though.