A very complete and nice game. I am a sucker for digging games, reminds me of Steamworld Dig which is a game series a like a lot.
If the backpack and time mechanics held more strategic weight the game would be elevated to a whole new level. It is rare that I care about a loop ending and the backpack filling up just forces me to empty it. I would have also liked a tune that was a little bit longer, it gets very repeptitive after a while.
I really enjoy the goal of building upward in a game about digging, that is a fresh take on the dig concept. I also think the game nails the theme very well.