Hello fellow exatly the same game maker! Well almost
Looks sounds and plays nice. I like the idea for more of a puzzler approach where you can only dig down and can' t jump. And I especially liked that you can dig 3 blocks in a sequence - combines to a surprising strategic planning.
There is one issue with the game - its far too long for a jam game :/ I think i played for 40 minutes to reach level 1000, and then realized that it probably never ends at which point I stopped. One of the upgrade should probably be to start at a certain level - 200, 500, 1000 for example - though not sure if this is what you were going for. If there's an end it probably doesn't make sense.
Really polished, fleshed out concept. The only issue i had is that when you spam space to dig down you can reach a shop, and then cancel it without buying anything:/ Or perhaps there should a button to simply restart? Though it was mild annoyence