Your game is good, it reminds a lot of SteamWorld Dig, which is nice ! The graphics and animations are cool, but it is misses feedback sounds for player actions. And it is too bad that the game has no link to the game jam theme, indeed, instead digging for rocks, we could dig for letters in order to make words. Anyway, nice work !
Edit : there is a link to the theme, indeed, the big rocks are the ancient rocks, but the text when you get ancient rock disappeared too quickly, so I couldn't read, and it didn't reappear after :/ So I missed totally the purpose of your game, because I targeted especially money x)