I mean. They did convert the entire game to use Godot. I wouldn't expect much.
I wouldn't expect as well, but clearly you're missing the line where they earned more than 50.000€ since the last update, and I'm not considering the itch.io sales because I cannot track them.
Also, it's a complain not only regarding content quantity, but most of all regarding content quality.
Let's face it, the dev hyped a lot, and given the amount of money and time they had, I was expecting scenes like Yasuka's timelapse for example, which is clearly the best one right now.