Hey got to the end.
Of course as others have mentioned reminds me of the Motherload game. I like the ship and what appears to be Paint graphics. And the sounds are nice too, did you record crushing a soda can yourself? The little random geysers were nice.
A bug or two. Digging in the tutorial didn't work for me, but the main game did. Also I somehow got stuck but that only happened once. Dirt digging animations keep playing even after you walk away.
Some gameplay stuff that I think could improve: flashlight should be more generous in size and duration, probably the graphic could fade off instead of being cut off, if only by using dithering at least. I think it'd be nice if there was a little indicator of how much something was worth when you picked it up or what your current haul was, to get you excited about gems, etc.
I made most of my money in that one area shallow enough where you can still see without a flashlight, filled with tons of gems for some reason. Barely made any money in the darkest areas.