Hi, very nice little game!
Here are some improvements ideas:
-if possible use the physical keys in Godot, it allows us with our AZERTY keyboards (I know we are weird people with our different keyboards ;) ) to have the WASD keys at the same place as if we had a QWERTY keyboard.
-maybe infinite ladders ? If you dig too deep you cannot come back, I suppose you are aware of the problem and that's one of the uses of the pause/leave button at top right.
But it's just small issues, the game is nicely polished imo, well done!