Oooh another idea would be the ability to upgrade features of you shop, such as upgrade your furnace to have it heat ingots faster, etc.
Recent community posts
Recently ran into a bug where at Day 13 customers no longer place orders. What happens is they will walk in the door, their order will pop up over their head for like half a second, then they'll just turn around and walk out.
An idea that I have seen that I agree with is snap-to placement on the anvil so ingots don't fall of so easily.
Another one that i've been thinking of is add a small town around the shop where you can go out and buy ingots and handles from physical stores so you don't just order them from a screen behind the building.
Besides that fun little game, look forward to future updates. :)
(Just found the Trello page so nvm on my town idea XD Now that I see what you have planned for it I'm very excited for its future)