The inscription in the first post in yellow will help you. Or do you really not understand how this game is filled with content? This is neither a kinetic novel nor a visual novel. It's a fucking sandbox. Here you need to constantly go back to the beginning of the game to get new content. For example, events at Mia's house were planned for version 0.05, but they only appeared now. And they are not a conditional continuation, but part of the middle of the current story. And this is how all the updates for Chapter 1 take place.
You need to consider that he is primarily an artist. They can spend hours doing one render and then continue the next day. He spends a lot of time trying to make an animation. He knows about the capabilities of Blender, but he is not familiar with this program.