Fascinating experience that feels fairly complete: the attention to details in the mapgen is very nice and makes exploring interesting. The custom inventory and radar makes for a nice feel as well.
One huge problem is lag: This game is a monster for anyone's CPU. Items that you've dug will take a few seconds to appear in the inventory, lights take many seconds to place, etc.
The story also seems a little rushed, perhaps more elements to the story and a more fulfilling finish would be nice. The radar and inventory can also be quite confusing for a new player: a better explanation of it would be helpful. Other than that, this seems fun and playable.