I think you highly overlook how time consuming and heavy writing these projects are. They have plans to start development back up once there finished with their current trajectory, whether it be full or partial.
They have also already released build 5 on Patreon as of now, for people who actively pay for a product that's eventually going to be free for everyone anyway, which is most likely the reason we haven't seen anything as of recently come to public (yet we're still getting merch thanks to our boi's at Pawprint Press). Also, if you don't want to pay, you don't have to. You're getting a free product anyway so why complain about an unfinished product that holds no financial weight to you at all (unless you're a Patreon sub)?
They've got plenty of other content for you to play, and if you're only here for the Adastra stuff, well I guess you'll have to wait like the rest of us for a full game, which at that point it's free to critique.
It's not how I do game development, but I'm not them nor do I work with them so it doesn't matter anyway.
TL;DR if you're too impatient to wait for the game, maybe try playing other games.