I would suggest adding some juice to the digging, or some friction with enemies, or that you have to make some choices. It feels a bit like an incremental game, but without reward. Of course, I understand it is a game jam game, so there was not much time to create it. This is just a suggestion if you would continue with the project.
I was confused in the beginning. Although the game is called "diggin it", I tried to walk towards the right by jumping. But the above-ground movement is weird, there is no jumping I think. Maybe show "space + down arrow" near the player at the start.
I also found it weird you could not access the tree house from the left.
I don't know what the bar is doing on top, when it is full? It also does not empty.
However, the idea of getting increasingly more gold for upgrades, mining deeper each time, is in itself a good concept though :)
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Thank you so much. Yes, we feel that too. The game is missing that juice. We are thinking of working on it again and maybe adding some more content. We liked the idea of putting some enemies which gives the player a choice. Yes, we think a little addition of a little tutorial board will be great for guiding players. We had the bar in mind that when it fills up, you get upgrades, something like an upgrade indicator, but I think that feature must be worked on.