To me that’s reasonable if it means the devs get to have a life and get to make something they really love. And it’s definitely reasonable given the fact that I paid fifteen euro’s for hundreds of hours of fun. They definitely do not owe me more, quite the opposite, really.
They made the game with a small team and apparently they want to finish it with a small team. I kind of respect the fact that they didn’t want to go (much) bigger, just because there was a lot of hype and money. And I also respect the fact that they don’t seem to care that it “cost them”.
If you want game development to be less about money, this is a pretty good example of what that could look like. It’s not the most efficient way of doing things, you are definitely right about that, but it’s great. And given what they have delivered so far, I think it’s hard to complain. There is a ridiculous amount of gameplay, for a low price. And everyone who bought it knows that it is unfinished.