The updates are shorter compared to other VN (like Far Beyond The World) because it doesn't use drawings/sprites. It uses fully articulated 3D models which are more pose-able and provide unlimited positioning but it take longer to get the exact pose used in the story frame. Yes, the author here reuses some character poses, but they also have alot more variety then you would ever find in drawings/sprites based VNs.
In other VNs, if the author isn't also the artist, they would have to pay an artist to make a new character sprite in the pose and expression they want and then they reuse them over and over.
If you want more of the story, become a patron. The patron version is currently at 1.35 and as a patron you can get access to other things like fully animated action scenes.