It's very well polished. I'd be very interested to know what your planning/scheduling process was. There's nothing apparently incomplete, which is impressive.
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I came up with the core idea pretty quickly as thankfully the theme clicked with me. I got just the basic gameplay working first (falling blocks and mining) before I worried about the looping and failure states.
I had initially wanted to include usable items as well as more detailed + directional sprites for the player but ran into so many issues with collision that I opted to cut that and make sure what I could include was as good as possible. Thanks for the comment!