1) There is no save.
2) The mechanics of melting are not clear. At first, I tried to transfer copper through the inventory, but it cooled down. Then I found the furnace button in the crucible, and it turned out that copper at 50 degrees can be poured :)
3) The mechanics of "choose an item in the inventory to use it on an object" are not clear due to the ability to mine ores without choosing a pickaxe.
4) The "Drag and Drop" mechanic periodically causes the movable object to hover in the air. After that, the item hangs there forever, and the game refuses to close, just hanging in the process.
To summarize. Interesting. But it's damp. It's very damp, completely unplayable :)