Pretty interesting mechanically. Very reminiscent of Motherlode (as another commentator said).
I like the gameplay loop, but it does feel very bad in the early game to get bottlenecked by hitting storage capacity from useless dirt. The balance feels like it could have been tipped towards giving less moves, but more storage capacity at the start of the game.
Making moves also feels VERY slow which contributes to the early game feeling like a slog. Wish the game let you make moves a lot faster.
I was slightly disappointed to see how much of the signposts were information that I could have otherwise figured out from gameplay, like a sign that says "this is a box that gives you ore!" next to a box that gives you ore. A bit more "show, don't tell" would have gone a long way, I feel.