Why? If you know you’ll play it it’s only $30 now, almost certainly higher at release. The Early Access is running great for me (on Linux no less) and the closest thing to a “bug” I’ve found so far (3 hrs in) is that some of the voiceover doesn’t 100% match the written text.

Seriously, it looks and feels very good already. My understanding is that only a few biomes are finished, and they’ll release more over time. But even the story beginnings are already solidly in place.