I'll quote the game developer Having a hard time who replied to me on Steam on July 22:
"5 months have passed since the release on Steam, and that’s when the development of the 4th episode began.
The first two episodes took me 4-5 months to make, but episodes 3 and 4 seem to have taken longer to make as they are both significantly longer. You're right though, I should update that in the description.
Anyway, just know that I'm working hard on it, but it won't be out very soon. I'll post a Steam update with more information soon".