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Story-wise, this was basically complete with 0.99, yes.

But after releasing 0.99, I felt like adressing some issues with the early-game story, which I did in 0.99.5, and then decided to add the last few sandbox scenes on my ToDo list now, instead of "at some later point in the future".
But it's now considered fully complete, there probably won't be any more updates after this.