@Logain Actually, mechanics and Balancing is more an Alpha thing. Beta is for adding in QoL and expanding the overall game territory, putting in those elements based on the originally balanced mechanics established in Alpha.
As I also said before, I'm sure they are already working on the other mobs for the other planets, so they can plug their graphics into the established mechanics and make the necessary adjustments to make it all work but feel different from world to world.
I also pointed out that they far overshot their monetary goals as established by the Kickstarter, and then even managed a financial backer beyond that, so the risk of them running out of money is actually a whole lot lower than originally anticipated. They don't have money to burn, but they do have enough money to be comfortable in keeping up development at their current pace, and handle unexpected delays. They are ahead of the game in the financing department.
Yes, their schedule has stretched out further than originally anticipated, but the state of the world at large has had a huge effect on that. I still believe they are going strong, and that if they were not, they would tell us, and be doing a huge funding drive to compensate for that. Prometheus even said he wouldn't rule out a 2022 release, as unlikely as that might be. I think they are figuring that Beta isn't going to take as many tests as originally planned, as most things are getting ironed out in Alpha to the point that Beta should be a breeze.