You can go down the list then: there are literally thousands of games out there that charge as much as or higher than From Orbit that don't even have half as much content. Go rail on them.
You should also only be referencing games that were made by one person. Deponia was made by a 90-employee company. Not all devs can be one-hit wonders like ConcernedApe behind Stardew Valley, nor should they be expected to.
That said, I agree that From Orbit is overpriced for its content. I thought the black hole at the end of the system map was just one segment of eight, but that was the end of the game. So, I'm glad I was able to play it at no cost, but I'm also not complaining.