Judge forgot to press "send" on the feedback but sent it to me afterward, so here's a copy paste (mostly for my own reference so I can have all the feedback in the same place :P) :
"This is a game I could chill and dig for hours without realizing how much time has passed. The environment, music, and mechanics all make for an incredibly enjoyable experience.
The digging and exploration of the environment felt great, I like how you implemented the theme with transforming what you mine into upgrades. I can see where you're going with the game and all the different ways you can enhance the character with the unavailable upgrades, which only makes me intrigued to see them completed. The story also left me wondering why we are digging down and curious to see what is down deep in the core.
I would have liked to have seen more obstacles/hazards that added tension and risk to the experience of digging into an unknown environment. Even without enemies you can build tension and create engaging puzzles through clever use of the environment.
Overall, I mainly want to see this game competed as I can see it being a really fun game."