The way this game is played appeals to me a lot. Crafting reminds me of Settlers of Catan in a way that I like. I can tell you put a lot of care into it. I would be very excited to see it expanded! (Especially the NPC things you mentioned above)
If you decide to do that, here are some thoughts you can consider or disregard as you like :)
* Sound and music would be lovely, and would provide nice atmosphere to accentuate all your hard work on the rest of the world.
* I think the HUD and its shade obstruct view. Smaller HUD elements or different spacing might help.
* Adding on-screen HUD elements might be a good way to help players remember the controls.
* Whether or not you decide to add sound, a visual indication that the player is taking damage might be a good idea.
* Is there a way to drop, scroll, or stack items? I picked up a whole bunch of stuff and when I made an axe, I couldn't find it because it was off the screen.
* It's easy to lose the player against the green background, especially in trees. A more contrasting color would make it easier to keep track of my location.
* I really like the progress bar when digging/chopping.
* Your mob designs are creative. They remind me a bit of Faxanadu, which is one of my favorite games.
I hope to see another of your games soon!