Good job submitting this project. The music and sound effects make it a nice atmosphere to get into.
As it it quite an incomplete project, I suspect that there is a lot that you guys weren't able to get into the game by the jam's deadline. On the mechanics side, I think the obvious problem is that player don't have a good way to get back up to the surface once they dig down. I also think the lamp drain rate is too quick for the pace of the game.
Another strange choice is the thumbnail, which sorts of feel quite misleading, because as the game starts you don't see the person on the thumbnail cover, and it creates confusion.