Already stated several times, in short: On hold until the other main projects are done (I think at least two).
Edit: On hold statement came with the new update. /Edit
Some more details: The game was meant as a side project, but 2 days per week aren't enough to work on it. Besides the mechanics and features that are added in each update, bugs kept piling up and breaking the game, thus implementing new features on a "broken system". There just isn't enough time to fix all the bugs while adding new features, it would take too long and too much focus, which isn't possible with the given schedule. Which is why it officially isn't a side project any more, the reason why it is on hold until after the other main projects are done. After that the focus will be on this game.
He also said that he still wants to do something else as a side project.