I'm glad you enjoyed it! I actually had installed and opened terrarria and a few other games to decide how to make the mining feel good. We also had a few conversations about making the HUD on the chunkier side to make it easier to play. This was the first mockup I was sent for the HUD 
We went with the final model because I felt this obscured to much vertical space in a game where depending on generation that can be important. I also will probably change the dialog and frontload more of the important stuff. The dialog and overworld was done by me (the dev) in the final 4 hours. We have plans to polish and update this after the jam since we are all fairly happy with the game. There is also a story of sorts here, if you make it deep enough and I'd like to incentivize that a bit more. Unfortunately I was under the impression I had an extra day and ended up pulling an all nighter on the last day of the jam.