Obviously not final, still have a gui color to decide on and final sprites besides the example ingots (which will be only retouched a little)
I went for a bit of a hybrid between Minecraft and Terraria. Basically a craft-list like Terraria or Starbound does but with a small interactive GUI for visuals like Minecraft, mainly to show total fuel left and an animated furnace-fire that animates for each material smelted.