Amazing presentation!
I love point&click games and this just feels so good.
Unfortunately I got stuck, I figured out the code, but I couldn't get the coal from the coal vein.
Plus it's hard to make out the 2 symbols on the lock.
Viewing post in Just a little longer jam comments
Here's the link for the walkthrough, i'm still updating it.
Everything is using spoiler tags so you can open them only when you're stuck!
https://cat-s-paw-games.github.io/just-a-little-longer-walkthrough/