I started playing solo around the September Hearth and Home update and I love it. I also ended up hooking a bunch of my friends on the game so I play multiplayer as well. The only issues I have with this game are occasional framerate drops but those don't happen much now since I made some changes to Windows. I don't think this game has ever crashed on me.

As for the gameplay, yes I've been able to do everything solo though I just started Plains content (the current final biome). It offers a good challenge and the building tools are tremendously fun. Subnautica used to be my favorite survival/crafting game but now I think this game has surpassed it even though it isn't finished yet. Even though it's still in EA, there is a lot of content to explore so it's probably the best $20 I've spent on a game in a long time.