ffs you don't know anything about game development.
what you described is alpha stage.
alpha stage: adding content over fixing bugs.
beta stage: content is added, bugs will be fixed, balance issues will be tackled. quality of life feautres may be added.
a good example is renegade x btw. it's in beta for years now. over that time no real content was added, instead bugs and balancing issues were tackled. the new content that will be added has a separate name called firestorm and will be in alpha, cause lots of content will be added later on. you could also call it a perpetual beta.
my god, can't be so difficult.
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here an outtake: "A Beta phase generally begins when the software is feature complete but likely to contain a number of known or unknown bugs."
right now stationmaster is in beta or (if the dev decides to bring in more content in the futre) a perpetual beta. the game is not in silver stage nor in any means a stable release.