I got stuck on the beginning long slide in the level just after unlocking dash? But then I realized you have to keep down held in to maintain the momentum. Whoopsie.
And then I got stuck on the level after the tutorial on how to press down to go through the thin ledges? In the level after the ledge tutorial, you have to go through a down ledge, but I sort of ran past the tutorial message in the last level and just pressing "down" wasn't working.
After an embarrassingly long time, and some generous buttonsmashing, I realized you have to press down and jump at the same time to go through a ledge, but having a tutorial message at the first ledge you have to go through to progress in addition to the one you can easily run past is maybe a good idea, especially with no level select.
Other than that, a neat little game! I like the dwarf fortress references, which is basically just the name, dwarf and digging too deep, but I still like it. :P
One thing I will note is at no point did it seem needed for me to discard coins, but I did sometimes need to bypass picking up coins because of the wall moving in. So maybe if I had discarded coins, the wall would have been slow enough for me to pick up coins? Seems kind of silly, so I just keep the ones I have.
p.s. You "hoard" coins, not "horde" ;)
p.p.s Sometimes my double jump doesn't seem to register. Somewhat annoying to fall into lava when I clearly did press the double jump.
p.p.s Sometimes white vertical lines will flash on the screen? No idea why? Might be a browser play issue maybe? Playing in chrome.
p.p.p.s A fun little game!
p.p.p.p.s If I restart the page after completing the game, I can't play again? Not sure if I broke something by not restarting from the game end screen and deciding to refresh for some reason. (My mind works in mysterious ways.) Will just download if I really feel like playing again I guess.