Is it worth to buy Starbound at the current state of development?

It's fun to play. It's still Glad Giraffe, a new stable version has not been released. Consequently, everything said on this board so far still applies.

If you want to follow the development cycle closely, I suggest you get it from Steam since otherwise you're looking at a few to several months between updates. There is a trade-off, though, since the steam client itself is such an intrusive resource hog.

It is a fairly intensive game, though. If you're hoping to run a multiplayer server count on keeping your max players low or build yourself a very robust server. The more people you have on one server, potentially the more worlds the server has to keep in memory and run.

Thanks for your response,

Whats about your savegames/ your character, does they'll be kept usually through the following updates?

Even within a single version of the "stable" branch, don't count on your save files working indefinitely, especially if you're using mods. Even vanilla is just not in a sufficiently mature state for me to suggest you count on your savefiles not getting corrupted. One one playthough I found myself unable to receive one particular quest at the outpost, which basically halted forward progression in terms of materlals and ship tiers entirely. But that's out of probably 20 characters. It really does mostly work. I've played buggier final releases.

A little late but anyway; the game feels mostly complete from what I have seen. Very deep into development I guess. I had not encountered any big errors; the biggest actually was the beam down point on a planet being changed (annoying because I build a base around that, but on the other hand that might have been the reason for the change). Unlike Daishaclaire I do play it very casual; only one char & just "recently" (in savegame timeframe progression) got the ability to visit the radiated, toxic worlds.

As for the developers enthusiasm with updates & information: Looks at the Man O' War: Corsair or Master of Orion (both InDevelopment games) sub-forums to see how it is done right.

I myself expected something better too. It was clear from the start that we won't be getting nightly builds here, but they are not releasing any stables either. So far it looks like we will get 1.0 without any release in between - weird way to do in-dev. Still somewhat better than preorder, this way we have at least something to try, with generous refund policy.

big update for stable and unstable on steam... dont know what that means for GOG but i love the game, and at its current level of completion im going to remove it from my steam account and purchase here.

Its far more engaging then Terraria mainly due to the fact you can "restart" a world essentially from scratch no forced world death like in Terraria.. more to do/explore... but thats what i like doing so its perfect.