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I added a new download file, add that in "www/data" and replace it with the other Map077. It'll put a chest in Meep Cave F1, with a new Dull Pickaxe.

I don't know how you're getting this bug, because on my end I can buy a Pristine with and without a Dull Pickaxe. But that file should get you a new pickaxe.

Do you have the full or Demo version? 

There isn't another in demo, but in full there's a hidden room in the Meep Cave F1, outside of Solari Town. There's an npc there who will sell you a Pristine Pickaxe. Also there will be a new version of the game tomorrow, that should iron out a lot of bugs.