As I went deeper, the game got a little glitchy. It would load a level, flash black, and then load a different level (sometimes a few times).
I personally didn't find the process of blowing up rocks and looking for stairs particularly engaging but I like the idea of delving deeper into the mines as fast as I can.
Maybe a bit of combat would spice it up?
I also think I got softlocked on the boulder puzzle (I couldn't push them out of the way)
Well done on making your second game! You should be proud.