The new update should fix this. You need to now find weapons to unlock the recipes.
Viewing post in Sand Alpha 0.6.15 - Save File Bug Fix comments
Cool, I'll give it a spin. How are you doing? Are you feeling the grind of game dev? Haha. Just want to share some encouragement from one of your biggest fans: this game was, is, and continues to be one of my absolute favorites to play, and I feel so lucky to have stumbled across it. Keep up the great work, sir!