Thanks for playing, and for such a detailed bug report! If it's not too much, could you email your Player.log (on windows it's in Users\YourUserName\AppData\LocalLow\Comfy Fox, LLC\YOURcursedSHOP\) to richard@comfyfox.com. The 2nd half of bugs seems like 1 thing went wrong which cascaded downwards and ruined a bunch of other scripts and I'd love to be able to replicate (and fix!) it. Either way I'll look into them today and tomorrow and hopefully have a fix soon.
Quests, such as to unlock more crafting, buildings, and other things are definitely some of the things I'm working on next. I'm glad that even with the hiccups you experienced you still had fun!