Hmm, very confusing. The mechanics aren't really explained. It says that I need to be careful to not run out of fuel, but doesn't explain how I would do that. Sometimes my fuel bar went back to full instead of me dying, but I don't know why. And the in-game text about the controls is wrong. If you ended up not having the time to explain these things in-game, maybe you could've explained them in the description. So my main feedback is: Try to look at the game from the perspective of a player who doesn't know how the game works.
Okay, so I played it again, and this time I realized you just need to have some material left when the fuel runs out. Looking back, it seems obvious, but I think the text about refueling the drill made me think I needed to be at the drill to refuel myself. So that made me not pay attention to the other stuff.
Looking at the other aspects, I think this is a good game. The core gameplay idea is pretty strong I think. The visuals are nice, and the digging feels good as well. I especially liked putting a bunch of fuel in the drill, then going off to explore and meeting the drill further down later, in order to not have to build back up. Once I understood how the game works, it was pretty fun.