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 :)

Unfortunately the controls and movement didn't feel good, the movement feels glitchy and very slow, so having to go back to the treehouse to get upgrades felt quite tedious. I also didn't enjoy having to keep pressing the spacebar repeatedly. It wasn't super intuitive that you're supposed to get to the treehouse by digging, I thought I should be able to just walk up to it, so that took me a while to understand. I really liked the design for the treehouse though, and the background music was nice and calming. 

Interesting idea! The combination of the theme and the soft guitar kind of reminded me of Dwarf Fortress. I was a little confused by the movement, and I think the movement speed is a little too slow. I also wished I could hold down space to mine instead of needing to tap every time, and I couldn't quite tell what the chests were for. I really liked the vibe and the atmosphere though :)

I made a beeline to the treehouse as it was glowing, but spent about a minute trying to get in or climb the ladder. I didn't realise it was a shop until I read the game's description, which slightly defeats the point of the brief. I think this game would really benefit from some tutorialisation, maybe some diagrams, to explain what I was meant to be doing at the start.

The visuals are well-executed and it's clear you're going for a minecraft/terraria inspired look. The music is quite melancholic - I spent my earnings on the second track in the shop thinking it would be a bit more fitting for a dwarf heading down the mines, but it maked me feel more like I was laying a cherished pet to rest. I thought varying the pitch of the sound effect when mining metals was a good touch. I also liked the zoom out to reveal more of the map.

The game has some issues. Like you can move the slider that is at the center of the screen. I can't, also, dig after a while or go near gold - chests I liked the game. And i liked the music .Good job!

you move too slowly while not digging, spamming the spacebar is not great as mine is quite noisy, I would have preferred any other key or if you could hold it

Sadly, the game never finishes loading for me. 

Unfortunately game is not in a playable phase. The movement is glitchy and features are not there yet.

Sadly I think the game is unplayable? Or at-least I couldn't figure out how to dig or climb any ledges.

i like the ambient guitar music.

Seems like there's a few bugs which hinder progression which is a real shame because I wanted to see how far it went.

Soundtrack is very chilled and I like the incremental mechanics. Would have been nice to have an upgrade which reduces the slowdown caused by carrying gold as at the moment it doesn't feel like the slowdown adds to the experience.