Let me preface this by praising you for the audio and visuals - the game exudes professionalism. That said, I must have missed some crucial step. I was expecting some more upgrades and found none, there was seemingly no consequence for staying in the dark and there was this rock on a chain that did... something? I ended up just mining aimlessly until the end cutscene. Reading the comments, it is safe to assume that I am entirely to blame for my confusion and I'm willing to give it a second try if you'd like to give me some hints. Overall very polished though!
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Hey, thanks for playing!
There's no real consequence for staying in the dark - I didn't think killing the player and forcing a replay was going to be fun in this short of a game, after all how many times can you dig through the same pile of mud?
The rock lifts the gate in that room :). It's initially closed, might've missed it in the dark.
There are two upgrades - one for speed and one for digging radius. They both aren't on the main path, but aren't very hidden either. A red glow gives them away.