Great solo game at the moment. Very well balanced for a solo experience.

How early access is it? For the part of the game that is there it is very content rich and they are soon adding to that in a few days. What is here is very well polished and few bugs. Mostly server related issues that solo would not matter.

Should you get the game yet?
That depends.
If you just want to get through it and beat the bosses then I would say wait.

If you enjoy the journey/exploration/building aspect then I would say pick it up. I keep starting new characters on new world seeds just to explore and find good biome placement for bases etc and develop that world up to it end and then start a new one since i enjoy that part of the game.

So it really comes down to what you want to get out of the game for enjoyment.